Desu: What it is, what it does, and when and how to use it

The Japanese word desu

“Desu”「です」 is a tricky word.

It is one of the first words that most Japanese language students encounter, yet it is also one of the most misunderstood. Far too many people are mistakenly led to believe that it just makes a sentence polite, and although that is effectively all it does in some cases, it is so much more than that.

The truth is that much of the time, “desu” is actually a verb.

In simple terms, “desu” is the copula verb “to be” or “is”. It is the verb that links together two nouns, or a noun and an adjective, as being equal: A = B. Typically, this will be done using the pattern:

A wa B desu.

In polite Japanese, “desu” can almost always be interpreted this way, but it can be much more confusing once we deviate from simple polite sentences. This is because the informal equivalent of “desu” takes different forms depending on the situation.

To truly understand “desu”「です」, we need to take a close look at what role it plays in different situations.

Understanding the role of “desu”「です」 will make it much easier to determine when we should (and shouldn’t) use it, and in what form.

Perhaps more importantly, a proper understanding of “desu”「です」 will also give us a more complete picture of Japanese grammar and sentence structure as a whole.

In this article, I’m going to explore in depth the practical uses of “desu”「です」 and its underlying purpose in different situations.

By the end, you should have a fairly clear understanding of what “desu”「です」 is, when you should use it, and, perhaps most importantly, how it fits into the overall Japanese grammar system.


Contents

Where “desu”「です」 fits into the overall picture

To really understand what “desu”「です」 is, it will help a lot if we first have a clear idea of how Japanese sentences of all types are structured. To use a bad analogy, a car is much more useful if we have proper roads to drive it on.

Let’s start by looking at the sentence structure model that we’ll be squeezing “desu”「です」 into:

Japanese sentence structure

If you haven’t seen this before, I highly recommend reading my article on Japanese sentence structure first before continuing.

The green “Verb” section is labelled as such because most of the time, in simple sentences where the verb is not “desu”「です」, that is all that goes there – a verb.

The truth is, however, that it would be more accurate to label the green section as the “predicate”, like so:

Japanese sentence structure (with predicate)

What’s a predicate, you ask?

It’s a scary sounding term, but it’s not too difficult to understand on a basic level, and it will help us tremendously in understanding what “desu”「です」 does, and how it compares to other verbs.

From Wikipedia*:

The predicate of a sentence mostly corresponds to the main verb and any auxiliaries that accompany the main verb.

(*There are actually competing definitions of the predicate, but this one from modern linguistic theory is what I’ll be using.)

In other words, in most cases, it’s just the main verb of the sentence, but sometimes this verb has a couple of other things attached to it.

Let’s look at a simple example in English:

Yoshi ate yakisoba.

Here, the main verb is “ate”, and the predicate is also “ate”. Now, here are a few similar sentences that have a different, more complex predicate. The predicates are in bold:

Yoshi did not eat yakisoba.

Yoshi is eating yakisoba.

Yoshi should eat yakisoba.

Yoshi will be eating yakisoba.

Notice that everything other than the predicate is exactly the same in each of these sentences, while the predicate itself varies considerably. Words like “did” and “not” are examples of the auxiliaries to the main verb that Wikipedia’s definition of the predicate is referring to.

One way to think of the predicate is to call it a “verb phrase”. This probably makes more sense intuitively, but we can’t technically call it this because “verb phrase” is actually a real term used to describe something else. Chances are you don’t care about that, though, so if it helps, any time you see the word “predicate” in this article, just think of it as meaning “verb phrase”.

Japanese predicates

In Japanese, the concept of the predicate is essentially the same, but the types of predicates that exist are different to English.

For simple sentences with a single verb, the predicate is just the main verb, the same as we saw in English:

Yoshi ate yakisoba.

yoshi wa yakisoba wo tabemashita.

よし は やきそば を たべました

よしはきそばをべました

Since the verb is the predicate, we can put this into our diagram and use either title to label the green section:

Yoshi ate yakisoba

Yoshi ate yakisoba.

For simple sentences like this, the “Verb” label makes sense because it is obviously much easier to understand (while still being accurate).

However, Japanese has other predicate forms where the “verb” label doesn’t really make sense. Here are the four types of predicates in Japanese:

  • Verbs (not including “desu”「です」, the copula verb – to be explained shortly)
  • Noun + copula verb (desuです)
  • I-adjectives
  • Na-adjectives

We could incorporate these into our diagram like this:

Japanese sentence with predicate types

This is fundamentally different from English, which as we know only has predicates made up of verbs plus any extra bits like “not” and “will”. Here’s an example:

English sentence predicate example

(Again, for more about this concept, check out my sentence structure article.)

In both languages, complete sentences must contain a predicate. In Japanese, that’s actually all they need, while English sentences have a couple of additional requirements, which we won’t go into.

Note: Despite what I’ve said previously, Japanese sentences do not actually need a verb to be grammatically complete. What they need is a predicate, though much of the time the predicate will explicitly include a verb anyway. English sentences also need a predicate, but the difference is that predicates in English must include a verb.

This explains why Japanese people will say things like “oishī!”「おいしい!」 (delicious) or “kawaī!”「かわいい!」 (cute), where in English we would normally add other words in order to form a complete sentence, such as “That is so cute!”.

In Japanese, these adjectives on their own are predicates – that is, “verb phrases” that alone are enough to form a complete sentence. This is not true in English, hence the need for additional words like “that is”. Adding words like this in Japanese, however, would generally be redundant.

These additional predicate forms are also why “desu”「です」 might seem confusing and inconsistent. Apart from pure verb predicates, “desu”「です」 is necessary in all three of the other predicate types when using polite Japanese – the same three types that do not exist in English.

So, if we want to truly understand “desu”「です」, it is actually quite simple – we know that the green part of our diagram is where the predicate goes:

Empty Japanese sentence with predicate

Now we just need to understand how “desu”「です」 fits into each of the different predicate forms. Let’s look at those now, starting with the one we are already familiar with.

Verb Predicates

We already know what to do with verbs other than “desu”「です」, but it will help to include them as a reference point for the other predicate types.

So, for the sake of comparison, here is the verb “tabemasu”べます」 (to eat) in the present, past, negative, and negative past tenses, in both polite and informal Japanese:

Polite Informal
Present/future tabemasuべます taberuべる
Negative present/future tabemasenべません tabenaiべない
Past tabemashitaべました tabetaべた
Negative past tabemasen deshitaべませんでした tabenakattaべなかった

These will be more relevant soon. If some of them are new to you, don’t worry – you don’t need to be familiar with them to understand the main concepts in this article.

Noun + Copula Verb Predicates

One of the uses of “desu”「です」 is as a “copula” verb, which is a special kind of verb seen in most (if not all) languages. Generally, copula verbs are used to express something equivalent or similar to:

A = B

Example:

Yoshi = a student

In English, we write this as:

Yoshi is a student.

In polite Japanese, we write this as:

yoshi wa gakusei desu.

よし は がくせい です

よしは学生がくせいです

“Is” and “desu”「です」 are the verbs that link the two other words (Yoshi and student/gakusei学生がくせい) together, defining one as equal to the other. This verb is the most common copula verb. (There are other copula verbs, and they vary between languages, but we don’t need to worry about them here.)

Common mistake

It might seem like “wa”「は」 is what links “Yoshi” and “gakusei”学生がくせい, but that’s not quite true. “Wa”「は」 is an essential piece of the puzzle, but it defines Yoshi as the topic of the sentence, which just means everything that comes after “wa”「は」 is about Yoshi.

If we drop the “desu”「です」, the sentence wouldn’t have a verb or a predicate, so the purpose of the word “gakusei”学生がくせい in particular would remain undefined. Now, the point of the sentence would likely be understood – ie. that Yoshi is a student – but it would be an incomplete sentence with an undefined meaning.

This can be confusing because adjectives work differently, but we’ll get to that very soon. In fact, that point of confusion is half the point of this article.

So, if “desu”「です」 is a copula verb, and one of the types of predicates in Japanese is “noun + copula verb”, then in this sentence (where “gakusei”学生がくせい is a noun), our predicate must be…

gakusei desu

がくせい です

学生がくせいです

We can therefore put this into our diagram like this:

Yoshi is a student

Yoshi is a student.

If we compare this to our first sentence, we can see that they both fit the same structure – as long as we remember that:

  • the green section should be labelled “predicate” (not “verb”); and,
  • Japanese has different types of predicates that do not exist in English.

With that knowledge, we can represent any sentence that Japanese might throw at us using the same old diagram.

One thing to note here is that in the case of sentences with a “noun + copula” predicate, we can’t really use most of the elements in the “Other information” section. They just don’t make sense.

What I mean by that is that we can’t include things like objects, as we did in our previous sentence:

Yoshi ate yakisoba

Yoshi ate yakisoba.

Doing this with “gakusei desu”学生がくせいです」 as the predicate would result in something absurd like this:

Yoshi ‘is a students’ yakisoba (??)

× yoshi wa yakisoba wo gakusei desu

× よし は やきそば を がくせい です

× よしはきそばを学生がくせいです

It’s the same for most of the “Other information” elements, with a few exceptions. There are certainly lots of situations where you can use the subject (ga), and some other elements may work in certain situations too, but most of the ones shown here generally need the predicate to be a verb that describes an action, which a “noun + desuです” predicate is not.

Taking it a step further (more advanced)

Some “Other Information” elements may seem like they can be used with a “noun + desuです” predicate based on the fact that they make sense if we just write them out in English. However, in these cases, the relationship between the words is often not the same. Here’s an example:

Yoshi is a student from Japan.

This does make sense, but we cannot translate this into Japanese as:

× yoshi wa nihon kara gakusei desu.

× よし は にほん から がくせい です。

× よしは日本にほんから学生がくせいです。

To understand why this works in English but not in Japanese, it will help to define this sentence in terms of “A = B”. Let’s see:

Yoshi = [a student from Japan]

Importantly, [a student from Japan] is a single “thing” (in this case a person), and in both English and Japanese, this single thing is expressed using a noun phrase.

The noun phrase we need here is:

a student from Japan

nihon kara no gakusei

にほん から がくせい

日本にほんから学生がくせい

This (or perhaps alternatively, “nihon kara kita gakusei”日本にほんから学生がくせい) is the noun that forms the “noun” part of the [noun + desuです] predicate, hence we would include this in our diagram like so:

Yoshi is a student from Japan

Yoshi is a student from Japan.

I won’t go into any more detail on noun phrases here, but they are incredibly powerful and allow us to build all manner of complex sentences. They’re also not as complicated as they probably seem. If you’re interested, my book has an entire chapter on them that explains all the variations of noun phrases and how to use them in sentences.

Now that we can see how “noun + copula verb” predicates fit into a sentence, let’s see how we can modify them in the same way that we modify basic verb predicates. We’ll start with…

Yoshi was a student.

yoshi wa gakusei deshita.

よし は がくせい でした

よしは学生がくせいでした

We simply conjugate our copula verb into the past tense, just like we do with regular verbs. The diagram is essentially the same as before:

Yoshi was a student

Yoshi was a student.

Let’s see how we would express the predicate “gakusei desu”学生がくせいです」 in other forms:

Polite Informal
Present/future gakusei desu学生がくせいです gakusei da学生がくせい
Negative present/future gakusei janai desu学生がくせいじゃないです gakusei janai学生がくせいじゃない
Past gakusei deshita学生がくせいでした gakusei datta学生がくせいだった
Negative past gakusei janakatta desu学生がくせいじゃなかったです gakusei janakatta学生がくせいじゃなかった

These are all predicates, and can therefore be substituted into the green part of our sentence, just like “gakusei desu”学生がくせいです」:

Yoshi is a student (various forms)

Yoshi is/was/isn’t a student.

Importantly, these predicates are all of the form:

Noun + copula verb

Our noun is obviously still just “gakusei”学生がくせい, so the second part of these sentences are, in effect, all just different forms of the copula verb “desu”「です」.

You might think that “janai”「じゃない」 is not a form of “desu”「です」, and it could be argued that it’s not, but ultimately, “desu”「です」 is word that originates from “de arimasu”「であります」, whlle “janai”「じゃない」 is a contraction of “dewa nai”「ではない」, the polite form of which is “de wa arimasen”「ではありません」.

It’s probably better not to think too much about the deeper implications of these more modern words (ie. desuです, janaiじゃない) being a combination of “de”「で」 and different forms of “arimasu”「あります」, but it is clear that they share the same origins.

I-Adjective Predicates

To understand these types of predicates, we need to look at i-adjectives (as well as na-adjectives) a certain way – and not the way you are probably used to.

I-adjectives and na-adjectives are often thought of as simple words, but we need to treat them as words that behave like verbs. Because, well, in many ways they do.

For i-adjectives, this is a bit more obvious, since we conjugate them when making them negative, putting them in the past tense, or both. For example:

Present/future oishīおいしい
Negative present/future oishikunaiおいしくない
Past oishikattaおいしかった
Negative past oishikunakattaおいしくなかった

Now, these can all be used in two different ways:

  1. To modify a noun (eg. oishī yakisobaおいしいきそば)
  2. As a predicate

Option 2 is obviously what we are concerned about here, so let’s try putting “oishī”「おいしい」 into a sentence as the predicate:

Yakisoba is delicious (informal)

Yakisoba is delicious.

If we compare this to the other predicate forms we’ve looked at so far, you might notice that something seems to be missing…

Yoshi ate yakisoba

Yoshi ate yakisoba.

Yoshi is a student

Yoshi is a student.

Yakisoba is delicious (informal)

Yakisoba is delicious.

Where’s the verb? The first one has an obvious verb, and the second has the copula verb “desu”「です」, but what about the last sentence?

As I noted earlier, Japanese sentences do not actually need a verb to be grammatically complete – they need a predicate.

Since i-adjectives are by themselves predicates, sentences like the following are grammatically complete:

yakisoba wa oishī.

やきそば は おいしい。

きそばはおいしい。

This is correct informal Japanese meaning, “Yakisoba is delicious”, even though there is no word that means “is”.

How is this possible?

Because in this case, “oishī”「おいしい」 is the predicate – a “verb phrase” that effectively includes the meaning of the verb “to be” within itself.

Hence, in this context, “oishī”「おいしい」 effectively means, “is delicious”.

That’s right – Japanese adjectives behave like verbs in some situations. They are basically super-words that are both adjectives and verbs rolled into one. This is very different to English.

Remember what we said about Japanese people using words like “oishī”「おいしい」 and “kawaī”「かわいい」 by themselves to describe things? They can do this because in this context, these words are actually predicates that effectively mean “is delicious” or “is cute”.

In addition, since Japanese sentences only need a predicate (unlike English sentences which must have a subject), they are, by themselves, complete sentences; there is no need to explicitly say “This is…” or “That is so…”.

Polite forms of i-adjective predicates

Hopefully you can now see how i-adjectives can be used as the predicate in a sentence, but we’re still missing something…

When we listed out the various conjugations of “tabemasu”べます」 and “gakusei + desu”学生がくせい + です」, there were two versions of each – an informal one and a polite one.

We need polite versions of i-adjective predicates too. Here they are:

Informal Polite
Present/future oishīおいしい oishī desuおいしい です
Negative present/future oishikunaiおいしくない oishikunai desuおいしくない です
Past oishikattaおいしかった oishikatta desuおいしかった です
Negative past oishikunakattaおいしくなかった oishikunakatta desuおいしくなかった です

Yep. We just add “desu”「です」 to each. These are the polite predicate forms of i-adjectives.

Let’s try putting one into our diagram:

Yakisoba was delicious (polite)

Yakisoba was delicious (polite).

So, just as we change the politeness of a regular verb sentence by changing the form of the verb…

Japanese sentence with various verb predicates

… and we change the politeness of a [noun + copula verb] sentence by choosing a different form of “desu”「です」

Japanese sentence with various noun + copula verb predicates

… we make a sentence with an i-adjective predicate polite or informal by choosing the appropriate form of the adjective.

Informal:

Japanese sentence with various i-adjective predicates (informal)

Polite:

Japanese sentence with various i-adjective predicates (polite)

Notice the similarities between this and the “noun + desuです” predicates from earlier?

We could argue that predicates made up of i-adjectives followed by “desu”「です」 are actually [adjective + copula verb], making it consistent with the [noun + copula verb] type of predicate.

You can think of it this way if you like, but it doesn’t help us understand how i-adjectives by themselves can be predicates in informal Japanese, or what we need to do to them to change them into other tenses (notice that the past tense versions of i-adjective predicates use “desu”「です」, not the past tense “deshita”「でした」).

Important! I-adjectives are not always predicates!

It’s important to note that as per option 1 of our ways to use adjectives, we can also put “oishī”「おいしい」 before a noun. Adjectives in Japanese are not always predicates!

Take this example:

oishī yakisoba

おいしい やきそば

おいしいきそば

Here, “oishī”「おいしい」 is not a predicate, and does not behave like a verb at all.

This is what’s called the “attributive form”, and it just means “delicious”, nothing more. It just so happens that for i-adjectives, the attributive forms and the (informal) predicate forms are the same (unlike na-adjectives, as we’ll soon see).

This is always the case. That is, adjectives that appear directly before nouns as part of a noun phrase always take their attributive form – even in other tenses, such as if we changed it to “oishikunai yakisoba”「おいしくないきそば」.

Always remember, i-adjectives can be either of the following:

  • adjective/verb super-word predicates (used at the end of a sentence/clause)
  • adjectives in the attributive form (used before a noun)

I-Adjective Summary

For practical purposes, the main points to remember are:

  1. When i-adjectives end a sentence, they are basically an adjective/verb super-word meaning “is [adjective]”.
  2. The polite form of that super-word is just the adjective itself (in the appropriate form) plus “desu”「です」.
  3. When an i-adjective is used before a noun, it is not the sentence predicate, so it does not have a polite form (ie. don’t add “desu”「です」).
Because sentences with i-adjective predicates are complete with or without “desu”「です」, it is easy to misunderstand this to mean that “desu”「です」 simply makes an informal sentence polite.

This is arguably correct in this case, but it is a massive oversimplification of “desu”「です」 that can lead to a big misunderstanding, as it does nothing to explain its usage in combination with nouns.

Na-Adjective Predicates

Given what we now know about the other predicate types, na-adjective predicates should be pretty easy. Let’s see how we deal with them.

Here are the same eight predicate forms of the na-adjective “yūmei”有名ゆうめい, which means “famous”:

Polite Informal
Present/future yūmei desu有名ゆうめいです yūmei da有名ゆうめい
Negative present/future yūmei janai desu有名ゆうめいじゃないです yūmei janai有名ゆうめいじゃない
Past yūmei deshita有名ゆうめいでした yūmei datta有名ゆうめいだった
Negative past yūmei janakatta desu有名ゆうめいじゃなかったです yūmei janakatta有名ゆうめいじゃなかった

You’ll notice that these are all exactly the same as they were for “noun + copula verb” predicates like “gakusei + desu”学生がくせい + です」:

Polite Informal
Present/future gakusei desu学生がくせいです gakusei da学生がくせい
Negative present/future gakusei janai desu学生がくせいじゃないです gakusei janai学生がくせいじゃない
Past gakusei deshita学生がくせいでした gakusei datta学生がくせいだった
Negative past gakusei janakatta desu学生がくせいじゃなかったです gakusei janakatta学生がくせいじゃなかった

In terms of meaning, however, they are obviously more like i-adjectives, as both i- and na-adjectives are descriptive words. They do not represent things like nouns do.

So, we can look at na-adjectives one of two ways.

The first option is to say that each of the above variations are conjugations of the na-adjective predicate “yūmei da”有名ゆうめいだ」, just as the i-adjective variations were conjugations of the predicate “oishī”「おいしい」.

oishīおいしい yūmei da有名ゆうめい
Present/future oishīおいしい yūmei da有名ゆうめい
Negative present/future oishikunaiおいしくない yūmei janai有名ゆうめいじゃない
Past oishikattaおいしかった yūmei datta有名ゆうめいだった
Negative past oishikunakattaおいしくなかった yūmei janakatta有名ゆうめいじゃなかった

The second option is to just say that the “da”「だ」 or “desu”「です」 after a na-adjective is a separate word – the copula verb “desu”「です」, to be precise:

Predicate form = [na-adjective + copula verb]

In this case, they are the same as [noun + copula verb] predicates in almost every way.

Just beware, however, that if looked at this way, the predicate form is [na-adjective + copula verb], not just “na-adjective” as described above. A na-adjective alone (without a form of “desu”「です」) is not a predicate, and thus cannot be used to complete a sentence.

Ultimately, it doesn’t really matter how you look at it – choose the one that makes sense to you. The result will always look something like this:

Japanese sentence with various na-adjective predicates

Yoshi is/was famous.

Either way, it is important to remember that an appropriate variation of “desu”「です」 (eg. da, deshita, datta,だ, でした, だった, etc.) needs to follow “yūmei”有名ゆうめい and other na-adjectives in order form them to include the “to be” meaning. Just like “yoshi wa gakusei”「よしは学生がくせい is an incomplete sentence, so is “yoshi wa yūmei”「よしは有名ゆうめい. Without a variation of “desu”「です」, they are not predicates, and will result in an incomplete sentence.

(Of course, colloquially, we don’t always need complete sentences, but you’re better off knowing what’s correct and are able to recognize when the rules are being “broken”, as opposed to being left in the dark wondering why nothing seems to be consistent).

Attributive form of na-adjectives

Also, don’t forget that, like i-adjectives, the above only applies to na-adjectives when used as predicates.

If we use an adjective before a noun, like we did with oishī yakisoba”おいしいきそば」, the adjective needs to be in the attributive form.

For na-adjectives, we put them into their attributive form by adding “na”「な」, which “connects” the adjective to the noun, like so:

A famous town

yūmei na machi

ゆうめい まち

有名ゆうめいまち

You can see that the usage here is similar to that of attributive i-adjectives (eg. oishī yakisobaおいしいきそば), except for the addition of “na”「な」. The other attributive forms of na-adjectives are the same as their informal predicate form counterparts:

Present/future yūmei na有名ゆうめい
Negative present/future yūmei janai有名ゆうめいじゃない
Past yūmei datta有名ゆうめいだった
Negative past yūmei janakatta有名ゆうめいじゃなかった

Each of these can be placed before a noun to modify it. For example:

A town that’s not famous (literally: A not famous town)

yūmei janai machi

ゆうめい じゃない まち

有名ゆうめいじゃないまち

Adding ‘Other Information’

So far, all of the example sentence diagrams relating to the three non-verb predicate types have included an empty ‘Other Information’ section.

I mentioned earlier that most of the elements that might normally appear in this part of a sentence don’t get used with these predicate types because they simply don’t make sense, but there are exceptions. The one you are likely to see most often is the Subject (marked by ga).

Let’s look at an example:

Fujinomiya has delicious yakisoba

Fujinomiya has delicious yakisoba.

I won’t go into this too much, but this basically means, “When talking about Fujinomiya, the yakisoba is delicious.”

The topic is “fujinomiya”富士宮ふじのみや(a city in Shizuoka prefecture), so that is what the sentence is talking about, and the subject is “yakisoba”きそば」, which means that yakisoba is the thing that is “being delicious”, as our predicate “oishī desu”「おいしいです」 tells us.

Now, in our earlier sentence, where we just said “yakisoba is delicious”, the word “yakisoba”きそば」 was the topic, not the subject, even though it was still the thing that was “being delicious” in that case too:

Yakisoba is delicious (informal)

Yakisoba is delicious.

The reason for this is that here, “yakisoba”きそば」 has effectively been “upgraded” from the subject to the topic. You can read more about this in my in-depth article about the difference between “wa”「は」 and “ga”「が」.

In any case, the point is that some ‘Other Information’ can be included, but only in a fairly limited number of situations.

Key Takeaways

This seemingly simple word has a lot of subtleties to it, and digging into those subtleties like we have here may leave you feeling a bit overwhelmed, but putting these lessons into practice should be much easier than the theory behind it. Let’s break down what we’ve covered.

Japanese sentences end with predicates, of which there are four types:

  • Verb
  • Noun + copula verb (desuです)
  • i-adjective
  • na-adjective

The polite forms of the last three all include “desu”「です」, which effectively means “is” or “to be”.

For [noun + copula verb] predicates, “desu”「です」 is the copula verb, so its meaning of “is” essentially tells us that [the topic (or subject) of the sentence] = [the word or phrase before “desu”「です」]. To change the tense or politeness, we just use a different form of “desu”「です」.

For i-adjective predicates, “desu”「です」 should be considered as the ending of the adjective’s polite present tense form. This is because in informal Japanese, the i-adjective can be used alone as a predicate meaning “is [adjective]”, so the base adjective effectively includes the meaning of “is” within itself. Adding “desu”「です」 puts the i-adjective predicate into its polite form, whatever tense it may be in.

Na-adjective predicates can be viewed like either of the above two predicate types, since their meaning and use is similar to i-adjectives, but their form is the same as [noun + copula verb] predicates. Either way, “desu”「です」 is used in the polite present tense of na-adjective predicates, and we change tenses and politeness by conjugating “desu”「です」.

That’s about it!

Things got pretty intense here, but I hope that this deeper understanding of what “desu”「です」 really is gives you a much clearer idea of when to use it, when not to use it, and how to use it correctly in its various forms.

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