If you have heard one Japanese word more than any other — in anime, in class, or in conversation — it is probably desu. It appears at the end of almost every polite sentence. But what does it actually mean?

Desu (です) is the polite form of "to be" in Japanese. It works like "am," "is," or "are" in English — linking the subject of a sentence to a description or noun. Without desu, most basic Japanese sentences would be incomplete or rude-sounding.

In this guide you will learn exactly what desu means, how to pronounce it correctly, how to use it in real sentences, when NOT to use it, and how it connects to everything you are learning for JLPT N5.

What Does Desu (です) Actually Mean?

Desu translates most directly as "is," "am," or "are" — depending on context. Linguists call it a copula: a linking word that connects a subject to a predicate.

Compare it to English:

In every case, desu is doing the same job as "am/is/are" — completing the sentence by stating what something or someone is. For a broader look at how Japanese sentences are built, see our Japanese Grammar Overview.

How to Pronounce Desu Correctly

This is one of the most common questions beginners have — and the answer surprises most people.

Desu is NOT pronounced "deh-SOO."

In natural Japanese, the final "u" in desu is almost completely silent. It is pronounced closer to "des" — rhyming with "yes" but with a "d" at the start.

• ❌ Incorrect: deh-SOO (sounds unnatural, like a foreigner)
• ✅ Correct: des (the "u" is whispered or nearly silent)

This silent "u" phenomenon is common in Japanese — it also affects words like desu ka (question form) and masu (verb ending). Check out our full Japanese Pronunciation Guide and our guide on common mistakes in Japanese pronunciation to build natural-sounding speech from the start.

How to Use Desu in Sentences

Pattern 1: [Subject] wa [Noun] desu — "X is Y"

This is the most fundamental sentence pattern in Japanese, and it is the backbone of JLPT N5 grammar.

[Subject] は [Noun] です。

Pattern 2: [Subject] wa [Adjective] desu — "X is [adjective]"

Desu also follows い-adjectives and な-adjectives to describe something politely.

With な-adjectives (na-adjectives):

With い-adjectives (i-adjectives): With i-adjectives, desu is added but does not change the adjective itself — it only adds politeness.

Pattern 3: Desu ka — turning a statement into a question

Add か (ka) after desu to make any statement into a yes/no question. Your voice stays flat — Japanese does not use rising intonation for questions the way English does. Learn more in our guide on how to ask questions in Japanese.

[Statement] + ですか？

Pattern 4: Desu ne / Desu yo — adding nuance

Japanese uses sentence-ending particles to add emotion and nuance to desu statements:

• ですね (desu ne) — seeking agreement, like "isn't it?" or "right?"
  
  
  • 今日は寒いですね。(Kyou wa samui desu ne.) — "It's cold today, isn't it?"
• ですよ (desu yo) — asserting information, adding emphasis
  
  
  • これは本当ですよ。(Kore wa hontou desu yo.) — "This is really true, I tell you."

For a deeper dive into all the particles in Japanese, see our Japanese Particles Guide.

Desu vs Da — What Is the Difference?

One of the most important grammar distinctions for learners is the difference between desu (です) and da (だ).

Example — same meaning, different register:

• Polite: 私は学生です。(Watashi wa gakusei desu.)
• Casual: 私は学生だ。(Watashi wa gakusei da.)
• Very casual: 学生だよ。(Gakusei da yo.)

For JLPT N5 and all classroom Japanese: always use desu. The casual form da becomes important at N4 and beyond. See our guide on what is the difference between JLPT N5 and N4 to understand when plain form becomes essential.

Desu in the Past Tense — Deshita (でした)

To talk about something that was true in the past, change desu to deshita (でした).

A simpler negative form used in conversation: じゃないです (ja nai desu) — "is not."

私は先生じゃないです。(Watashi wa sensei ja nai desu.) — "I am not a teacher."

For full coverage of verb forms, see our guide on Japanese verb conjugation.

Common Mistakes Beginners Make with Desu

Mistake 1: Pronouncing the "u" fully

As explained above, the "u" in desu is nearly silent. Pronouncing it as a full "deh-SOO" is the most instantly recognisable sign of a beginner. Practice saying "des" until it feels natural. Read more in our guide to improving Japanese pronunciation fast.

Mistake 2: Adding desu after i-adjectives incorrectly in past tense

The past tense of i-adjectives does NOT use deshita. Instead, the adjective itself changes:

• ✅ Correct: おいしかったです (oishikatta desu) — "It was delicious."
• ❌ Incorrect: ~~おいしいでした~~ — This is a grammar error.

Mistake 3: Using desu after verb stems

Desu follows nouns and adjectives — not verbs. Verbs have their own polite ending: masu (ます).

• ✅ Correct: 食べます (tabemasu) — "I eat." (verb + masu)
• ❌ Incorrect: ~~食べdesu~~ — Desu never attaches to verbs.

Mistake 4: Forgetting desu in formal writing

In casual texting, Japanese people sometimes drop desu. But in any formal writing — Japanese essays, JLPT answers, emails — always include desu.

Desu and the JLPT N5 Exam

Desu appears in virtually every single question in the JLPT N5. Understanding it is not optional — it is foundational.

In the grammar section, you will be tested on:

• Correct placement of desu in sentences
• Choosing between desu and deshita (present vs past)
• Forming negative sentences with de wa arimasen
• Questions using desu ka

In the reading section, every passage uses desu-style polite sentences. In the listening section, you will hear desu in every other utterance.

For full exam preparation, see:

• JLPT N5 Study Guide
• Free JLPT N5 Sample Questions with Answers
• How to Prepare for JLPT N5 in 30 Days
• JLPT N5 Study Material

Bottom line: master desu before anything else in JLPT N5 grammar.

Frequently Asked Questions

What does desu mean in English?

Desu (です) means "am," "is," or "are" in English — it is the polite Japanese copula that links a subject to a noun or adjective. For example, Watashi wa gakusei desu means "I am a student." See also: What Does Watashi Wa Mean in Japanese?

Is desu always at the end of a sentence?

Yes — in standard Japanese sentence structure, desu always comes at the end of the clause it belongs to. Japanese is a verb-final language, meaning the most important grammatical element always comes last. Learn more about Japanese sentence structure.

Why do some people say "desu" on the internet as a joke?

The internet meme use of "desu" (often written "desu~") originated from early English-speaking anime fan communities who picked up on how frequently the word appears in Japanese. It has no special meaning in this context — it is just an internet in-joke referencing anime speech patterns.

What is the difference between desu and arimasu?

Both can translate as "is/are" but they are used differently:

• Desu (です) is used to say what something is — identity and description.
• Arimasu (あります) means "exists" or "there is/are" — used for inanimate objects and location.

本はここです。(Hon wa koko desu.) — "The book is here." (identity/location) 本があります。(Hon ga arimasu.) — "There is a book." (existence)

How do you make desu negative?

The formal negative of desu is ではありません (de wa arimasen). In casual speech, じゃないです (ja nai desu) or じゃない (ja nai) are used. Gakusei ja nai desu = "I am not a student."

What is the past tense of desu?

The past tense of desu is deshita (でした), meaning "was/were." Gakusei deshita = "I was a student."

Do I need desu for JLPT N5?

Absolutely. Desu is the most fundamental grammar point in JLPT N5. You cannot pass N5 without fully understanding how to use desu in affirmative, negative, past, and question forms. Check out our tips and tricks to prepare for JLPT N5.

Is desu the same as da?

They mean the same thing but are different registers. Desu (です) is polite and appropriate for formal use, while da (だ) is the plain/casual form used with friends and family. Always use desu in JLPT exams and Japanese class.

Start Learning Japanese Properly — Classes in Delhi

Understanding desu is your foundation. Everything in Japanese — from JLPT N5 sentence patterns to polite business conversation — is built on this one small word. But mastering desu is just the first step on a much bigger and deeply rewarding journey.

At Japanese Language Delhi, we offer structured JLPT N5 and N4 courses taught by experienced Japanese language instructors. Whether you are a complete beginner or already familiar with hiragana, our classes will take you to exam-ready fluency.

Explore courses near you:

• Japanese Language Courses for Beginners
• JLPT N5 Classes in Delhi NCR
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Learn more about Japanese grammar and exams:

• What Does Watashi Wa Mean in Japanese?
• Watashi vs Boku vs Ore — Which Pronoun Should You Use?
• Japanese Grammar Overview
• Japanese Particles Guide
• Japanese Sentence Patterns for JLPT N5 and N4
• How to Ask Questions in Japanese
• How to Learn Japanese
• Easiest Ways to Learn the Japanese Language
• Japanese Language Learning Roadmap
• How to Prepare for JLPT Exam
• How to Pass the JLPT
• Free JLPT Practice Tests Online N5 to N1
• JLPT Exam Fees Structure