A1 · Beginner Chapter 9

The 'To Be' Verb: Desu

1 Total Rules
10 examples
5 min
Rules in This Chapter Quick Practice

Chapter in 30 Seconds

Master the 'equals sign' of Japanese to introduce yourself with confidence and politeness.

  • Construct basic sentences using the polite copula 'desu'.
  • Identify yourself, your profession, and your nationality.
  • Distinguish between polite 'desu' and casual 'da' in social contexts.
Connect your world with the power of 'Desu'.

What You'll Learn

Hey language hero! Ready to dive into the absolute core of Japanese sentence-making? In this chapter, you're about to unlock a superpower: how to use the magical word desu (です) to construct polite and proper sentences. Think of desu as your ultimate polite equals sign or a super-glue that helps you state this is that or I am this. Want to know why this is so crucial? Because without desu, your Japanese can sound really blunt, especially when you're just starting out. You'll learn how to introduce yourself (I am Alex), state your profession or nationality (

I am a student
or I am Iranian), or even describe objects (
This is a book
). Your learning journey in this chapter goes like this: First, we'll get cozy with desu, the polite form, understanding exactly when and where to use it to sound respectful. Then, you'll gently discover da (だ), which is desu but for more casual, friendly situations. Don't worry, it's way easier than it sounds! It's kind of like knowing when to say please come in versus just come in in English. By the end of this chapter, you'll be able to confidently form basic, polite Japanese sentences that express your identity or state simple facts. Imagine yourself in Japan saying
Watashi wa Ken desu
(I am Ken!) without a second thought about politeness. This is a massive step, so let's get started!

Learning Objectives

By the end of this chapter, you will be able to:

  1. 1
    By the end you will be able to: State your name and occupation using the [A] wa [B] desu structure.
  2. 2
    By the end you will be able to: Identify common objects in a room and label them politely.

Chapter Guide

Overview

Hey language hero! Ready to dive into the absolute core of Japanese sentence-making? In this chapter, you're about to unlock a superpower: how to use the magical word desu (です) to construct polite and proper sentences. Think of desu as your ultimate polite "equals sign" or a super-glue that helps you state "this is that" or "I am this." This foundational element is absolutely essential for anyone learning A1 Japanese grammar, setting the stage for all your future conversations.
Want to know why this is so crucial for basic Japanese sentences? Because without desu, your Japanese can sound really blunt, especially when you're just starting out. You'll learn how to introduce yourself ("I am Alex"), state your profession or nationality ("I am a student" or "I am Iranian"), or even describe objects ("This is a book"). Mastering desu is the gateway to polite communication, a cornerstone of Japanese politeness.
Your learning journey in this chapter goes like this: First, we'll get cozy with desu, the polite form, understanding exactly when and where to use it to sound respectful. Then, you'll gently discover da (だ), which is desu but for more casual, friendly situations. Don't worry, it's way easier than it sounds! It's kind of like knowing when to say "please come in" versus just "come in" in English. By the end of this chapter, you'll be able to confidently form basic, polite Japanese sentences that express your identity or state simple facts. Imagine yourself in Japan saying "Watashi wa Ken desu" (I am Ken!) without a second thought about politeness. This is a massive step in your Japanese language learning journey, so let's get started!

How This Grammar Works

Let's unravel the mystery of the Japanese 'to be' verb, specifically desu and da. At its heart, desu (です) acts as a polite copula, functioning much like "is," "am," or "are" in English. Unlike English, where "to be" verbs change based on the subject (I *am*, you *are*, he *is*), desu remains constant, making it wonderfully straightforward for A1 Japanese learners. This is key to Mastering the Japanese Copula: How to Use 'Desu' Correctly.
The basic structure for using desu is simple: [Noun/Pronoun] + wa (は) + [Noun/Adjective] + desu (です). The particle wa marks the topic of the sentence. For example, to say "I am a student," you'd say: Watashi wa gakusei desu (私は学生です). Here, watashi (私) means "I," gakusei (学生) means "student," and desu politely connects them. This fulfills The "Is/Am/Are" of Japanese: Using Desu (です) beautifully. Similarly, for "This is a book": Kore wa hon desu (これは本です). Desu adds The Politeness Sticker to your statements, making them appropriate for most situations.
Now, let's talk about da (だ). Think of da as the casual version of desu. It conveys the same meaning of "is/am/are" but without the politeness. It's used in very informal settings, typically with close friends, family members, or when speaking to oneself. The structure is even simpler: [Noun/Pronoun] + [Noun/Adjective] + da (だ). For instance, "I am a student" in a casual context would be Watashi wa gakusei da (私は学生だ). While crucial for Mastering 'Desu' (です): The Japanese 'To Be' and understanding Japanese 'is' and 'am': Using Desu and Da, beginners should primarily stick to desu to avoid sounding rude. You'll naturally incorporate da as you become more comfortable with Japanese grammar and social nuances.

Common Mistakes

  1. 1✗ Wrong: Watashi Amerika-jin. (I American.)
✓ Correct: Watashi wa Amerika-jin desu. (私はアメリカ人です。) (I am American.)
*Explanation:* Omitting desu makes your sentence sound incomplete and very blunt, like just listing words. Desu is crucial for politeness and completing the thought. Don't forget the topic particle wa either!
  1. 1✗ Wrong: Sensei wa Tanaka-san da. (The teacher is Tanaka-san. - said to a teacher)
✓ Correct: Sensei wa Tanaka-san desu. (先生は田中さんです。) (The teacher is Tanaka-san.)
*Explanation:* Using da in formal or semi-formal situations, especially when addressing someone with respect (like a teacher or stranger), is considered rude. Always use desu for politeness unless you are certain the context is casual.

Real Conversations

A

A

Hajimemashite. Watashi wa Ken desu. (はじめまして。私はケンです。) (Nice to meet you. I am Ken.)
B

B

Hajimemashite. Watashi wa Mari desu. Gakusei desu. (はじめまして。私はマリです。学生です。) (Nice to meet you. I am Mari. I am a student.)
A

A

Kore wa nan desu ka? (これは何ですか？) (What is this?)
B

B

Kore wa tokei desu. (これは時計です。) (This is a watch.)
A

A

Anata no shigoto wa nan desu ka? (あなたの仕事は何ですか？) (What is your job?)
B

B

Watashi wa inishia desu. (私は医者です。) (I am a doctor.)

Quick FAQ

Q

Can desu be used with action verbs in A1 Japanese grammar?

No, desu primarily connects nouns or adjectives to form statements of identity or description. It does not directly attach to action verbs like "eat" or "run."

Q

Is desu always necessary for every sentence in basic Japanese?

While not *every* sentence, desu is almost always necessary for polite, complete statements at the A1 level. Omitting it makes sentences sound informal or incomplete.

Q

When is it okay to use da instead of desu in Japanese conversations?

You should only use da in very casual settings with close friends or family, or when speaking to yourself. It implies a high level of familiarity and can be impolite if used with strangers or superiors.

Q

What is the negative form of desu for Japanese beginners?

The polite negative form of desu is de wa arimasen (ではありません) or its more common contraction, ja arimasen (じゃありません). For example, Sensei ja arimasen (I am not a teacher).

Cultural Context

In Japanese society, politeness is paramount, and desu is a fundamental linguistic tool for expressing it. Using desu demonstrates respect towards your listener, regardless of their status. This makes it an indispensable part of Japanese communication, especially for learners. The nuanced choice between desu and da reflects the speaker's relationship with the listener and the formality of the situation. While da is common among close peers, defaulting to desu is always the safest and most appropriate choice when in doubt, ensuring you maintain respectful interactions in Japan.

Key Examples (2)

1

Watashi wa gakusei desu.

I am a student.

The Politeness Sticker: Desu (です)
2

Kore wa pen desu.

This is a pen.

The Politeness Sticker: Desu (です)

Tips & Tricks (1)

💡

Listen for the 'u'

In fast speech, the 'u' in 'desu' disappears. Listen for 'dess'.
frontend.learn_grammar.from_rule: The Politeness Sticker: Desu (です)

Key Vocabulary (6)

私(わたし) I / Me 学生(がくせい) Student 先生(せんせい) Teacher / Professor 日本人(にほんじん) Japanese person 本(ほん) Book 名前(なまえ) Name

Real-World Preview

school

The First Day of Class

Review Summary

  • [Noun A] は [Noun B] です。

Common Mistakes

In English, we can sometimes drop the 'is' in very casual speech, but in Japanese, ending a sentence without 'desu' (or 'da') makes it incomplete and potentially rude to strangers.

Wrong: 私(わたし)は ケン。(Watashi wa Ken.)
Correct: 私(わたし)は ケン です。(Watashi wa Ken desu.)

You cannot add 'desu' directly after a dictionary-form verb to make it polite. Verbs have their own polite form (-masu), which you learned in Chapter 8.

Wrong: 食(た)べる です。(Taberu desu.)
Correct: 食(た)べます。(Tabemasu.)

Japanese is a SOV (Subject-Object-Verb) language. The verb or copula ('desu') must always come at the very end of the sentence.

Wrong: 私(わたし) です 学生(がくせい)。(Watashi desu gakusei.)
Correct: 私(わたし)は 学生(がくせい) です。(Watashi wa gakusei desu.)

Next Steps

You've just mastered one of the most important words in the Japanese language! Keep practicing your self-introduction; it's the key to making new friends in Japan. You're doing great, hero!

Mirror Talk

Labeling your room with sticky notes using [Name] desu

Continue to: Stating Existence and Identity

Quick Practice (5)

Fix the sentence.

Find and fix the mistake:

{食|た}べるです。

✓ Correct! ✗ Not quite. Correct answer: {食|た}べます
Verbs don't take desu.

frontend.learn_grammar.from_rule: The Politeness Sticker: Desu (です)

Fill in the blank.

{今日|きょう}は{暑|あつ}___。

✓ Correct! ✗ Not quite. Correct answer: いです
Adjective + desu.

frontend.learn_grammar.from_rule: The Politeness Sticker: Desu (です)

Choose the correct question form.

{彼|かれ}は{先生|せんせい}___?

✓ Correct! ✗ Not quite. Correct answer: ですか
Questions need 'ka'.

frontend.learn_grammar.from_rule: The Politeness Sticker: Desu (です)

Fill in the blank.

{私|わたし}は{学生|がくせい}___。

✓ Correct! ✗ Not quite. Correct answer: です
Desu is the polite copula.

frontend.learn_grammar.from_rule: The Politeness Sticker: Desu (です)

Which is formal?

Choose the formal sentence.

✓ Correct! ✗ Not quite. Correct answer: {私|わたし}は{学生|がくせい}です
Desu is formal.

frontend.learn_grammar.from_rule: The Politeness Sticker: Desu (です)

Score: /5

Common Questions (2)

You can, but it might sound distant or like you are being sarcastic.
In Japanese, 'ka' is the question particle. It replaces the question mark.
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Stating Existence and Identity
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