A1 Grammar Basics 5 min de lecture

The Sentence Pattern [A]

The A wa B desu pattern is the foundational building block for identifying people and things politely in Japanese.

The Rule in 30 Seconds

  • A wa B desu means 'A is B' in a polite way.
  • The particle wa marks the main topic of your sentence.
  • Always write wa as the hiragana character ha in this context.
  • Place desu at the very end to finish the sentence politely.

Quick Reference

Topic (A) Marker (wa) Identity (B) Polite Ending
watashi (I) wa Tanaka desu
kore (this) wa hon (book) desu
sore (that) wa mizu (water) desu
are (that over there) wa yamada-san desu
koko (here) wa gakkou (school) desu
kyou (today) wa yasumi (holiday) desu
nihon (Japan) wa kirei (beautiful) desu

Exemples clés

3 sur 9
1

watashi wa gakusei desu.

I am a student.

2

kore wa ocha desu.

This is green tea.

3

Tanaka desu.

(I) am Tanaka.

⚠️

The 'ha' Trap

Always write the topic marker 'wa' with the hiragana character 'ha'. If you use the character 'wa', native speakers will know you are a total newbie immediately!

🎯

Drop the I

Don't say 'watashi wa' every single time. It sounds repetitive and a bit self-centered. If the context is clear, just skip to the good part.

The Rule in 30 Seconds

  • A wa B desu means 'A is B' in a polite way.
  • The particle wa marks the main topic of your sentence.
  • Always write wa as the hiragana character ha in this context.
  • Place desu at the very end to finish the sentence politely.

Overview

Welcome to the very first step of your Japanese journey. Think of this pattern as your ultimate social icebreaker. It is the foundation for everything you will say. Whether you are introducing yourself or ordering coffee, you need this. This pattern is the Japanese equivalent of saying "A is B." It is simple, powerful, and essential. You will use it to define the world around you. You will use it to tell people who you are. It is the most common structure in the entire language. Mastering it makes you sound clear and polite immediately.

How This Grammar Works

In English, we say "I am a student" or "This is a burger." Japanese works a bit like a math equation. You have two main parts: the Topic and the Identity. The word wa acts like an equals sign. It points to the topic of your sentence. The word desu sits at the very end. It acts like a polite period or the word "is." In Japanese, the verb or copula always comes last. This might feel backwards at first. Just remember: Topic first, identity second, politeness last. It is like a well-structured sandwich. The wa and desu are the bread. Your information is the delicious filling.

Formation Pattern

  1. 1Creating these sentences is easier than building IKEA furniture. Just follow these three steps:
  2. 2Choose your Topic (A). This is what you want to talk about.
  3. 3Add the particle wa. Note that it is written as ha but pronounced wa.
  4. 4Add your Identity (B) followed by desu.
  5. 5Example structure: A (Topic) + wa (Marker) + B (Identity) + desu (Polite ending).
  6. 6watashi (I) + wa + gakusei (student) + desu = I am a student.
  7. 7kore (this) + wa + pen (pen) + desu = This is a pen.
  8. 8Tanaka-san + wa + sensei (teacher) + desu = Mr. Tanaka is a teacher.

When To Use It

You will use this pattern constantly in daily life. Use it when you meet someone for the first time. Use it at a restaurant to identify your order. It is perfect for describing things you see. Use it when checking into a hotel or at a job interview. It works for names, jobs, nationalities, and even colors. If you want to say something "is" something else, this is your tool. It is the "Gold Standard" for being polite to strangers. You can never go wrong with desu in a professional setting. It shows you have good manners.

When Not To Use It

Do not use this pattern for actions. If you are running, eating, or sleeping, you need verbs. desu is only for stating what things *are*, not what they *do*. Think of it like a photograph versus a movie. desu is for a still photo. Verbs are for the movie. Also, avoid using it with your very close friends in casual settings. It can sound a bit too stiff or formal. With friends, people often drop the desu or use da. But for now, stick to desu. It is much safer to be too polite than too rude. Think of it like wearing a suit to a wedding. You look great and everyone respects you.

Common Mistakes

The biggest trap is the spelling of wa. You must write it as the character ha. Every beginner messes this up at least once. Don't worry, it's a rite of passage. Another mistake is forgetting desu entirely. Without it, your sentence just hangs in the air. It’s like ending a sentence with a comma instead of a period. Some people also try to put wa after everything. Remember, wa only marks the main topic. Also, don't put desu in the middle of the sentence. It belongs at the very end, like a loyal dog guarding the gate. Yes, even native speakers get lazy, but you should stay sharp.

Contrast With Similar Patterns

You might hear people using ga instead of wa. This is the classic Japanese grammar headache. For now, think of wa as a spotlight. It shines on the topic you want to discuss. ga is more like a finger pointing at a specific culprit. wa sets the stage; ga identifies the actor. You might also see da. This is just the casual version of desu. Use da with your cat or your brother. Use desu with everyone else. Think of desu as a tuxedo and da as pajamas. Both are clothes, but they belong in different places.

Quick FAQ

Q. Why is it written as ha?

A. It's a historical quirk. Languages are weird sometimes. Just accept the chaos.

Q. Can I leave out watashi wa?

A. Yes! If it's obvious you're talking about yourself, drop it. Japanese loves being efficient.

Q. Is desu a verb?

A. Technically, it's a copula. It functions like the verb "to be."

Q. Can I use this for adjectives?

A. Absolutely. kore wa oishii desu means "This is delicious."

Q. What if I want to be even more polite?

A. There are fancier versions like de gozaimasu. But save that for when you meet the Emperor.

Reference Table

Topic (A) Marker (wa) Identity (B) Polite Ending
watashi (I) wa Tanaka desu
kore (this) wa hon (book) desu
sore (that) wa mizu (water) desu
are (that over there) wa yamada-san desu
koko (here) wa gakkou (school) desu
kyou (today) wa yasumi (holiday) desu
nihon (Japan) wa kirei (beautiful) desu
⚠️

The 'ha' Trap

Always write the topic marker 'wa' with the hiragana character 'ha'. If you use the character 'wa', native speakers will know you are a total newbie immediately!

🎯

Drop the I

Don't say 'watashi wa' every single time. It sounds repetitive and a bit self-centered. If the context is clear, just skip to the good part.

💬

Politeness Power

In Japan, ending with 'desu' is like wearing a polite smile. Even if your Japanese is broken, adding 'desu' at the end makes you look respectful.

💡

Sentence LEGOs

Think of the sentence like building blocks. You can swap 'A' and 'B' easily once you know the connectors 'wa' and 'desu'.

Exemples

9
#1 Basic Introduction

watashi wa gakusei desu.

Focus: watashi wa

I am a student.

Standard way to introduce your occupation.

#2 Identifying Objects

kore wa ocha desu.

Focus: ocha desu

This is green tea.

Use 'kore' for things near you.

#3 Edge Case: Omission

Tanaka desu.

Focus: desu

(I) am Tanaka.

The topic 'watashi wa' is often dropped if obvious.

#4 Edge Case: Nationality

Sumisu-san wa igirisu-jin desu.

Focus: igirisu-jin

Mr. Smith is British.

Add 'jin' to a country for nationality.

#5 Formal Context

kochira wa chichi desu.

Focus: kochira

This (person) is my father.

'kochira' is a polite way to introduce someone.

#6 Common Mistake Corrected

✗ watashi wa desu Tanaka. → ✓ watashi wa Tanaka desu.

Focus: Tanaka desu

I am Tanaka.

The verb/ending must always go at the very end.

#7 Common Mistake Corrected

✗ watashi wa Tanaka. → ✓ watashi wa Tanaka desu.

Focus: desu

I am Tanaka.

Forgetting 'desu' makes the sentence incomplete and rude.

#8 Advanced Usage: Possession

kore wa watashi no kagi desu.

Focus: watashi no

This is my key.

Using 'no' to show possession within the 'B' part.

#9 Advanced Usage: Question

are wa nan desu ka?

Focus: nan desu ka

What is that over there?

Adding 'ka' turns the pattern into a question.

Teste-toi

Complete the introduction: 'I am a teacher.'

watashi ___ sensei ___.

✓ Correct ! ✗ Pas tout à fait. Rponse correcte : wa / desu

You need the topic marker 'wa' and the polite ending 'desu'.

Identify the object: 'This is a book.'

kore wa ___ desu.

✓ Correct ! ✗ Pas tout à fait. Rponse correcte : hon

'hon' is the Japanese word for book.

Correct the grammar: 'That is coffee.'

sore ___ koohii ___.

✓ Correct ! ✗ Pas tout à fait. Rponse correcte : wa / desu

While written as 'ha', we call it 'wa' and use 'desu' for politeness.

🎉 Score : /3

Aides visuelles

Sentence Breakdown

Topic (A)
watashi I
Marker
wa (Topic Marker)
Identity (B)
gakusei Student
Ending
desu is/am

Should I use A wa B desu?

1

Are you identifying a person or thing?

YES ↓
NO
Use a verb instead.
2

Is the situation polite or professional?

YES ↓
NO
Consider using 'da' (casual).
3

Use 'A wa B desu'!

What can be 'B'?

💼

Occupations

  • sensei
  • isha
  • kaishain
📦

Objects

  • hon
  • pen
  • sumaho

Questions fréquentes

21 questions

It is a remnant of old Japanese spelling. Just think of it as a secret code that only the 'wa' topic marker uses.

It means all of them! Japanese doesn't change the ending based on the person, which is a huge relief compared to English or Spanish.

Yes! You can say watashi wa nijuu-sai desu (I am 20 years old). It works perfectly for numbers.

Technically no, it is a 'topic' marker. The subject might be different, but for A1 levels, treating it like a subject marker is a safe bet.

Change desu to dewa arimasen. For example, gakusei dewa arimasen means 'I am not a student'.

Just add ka to the end! Tanaka-san wa gakusei desu ka? means 'Is Mr. Tanaka a student?'

Yes, it works with 'i-adjectives' and 'na-adjectives'. ringo wa akai desu means 'The apple is red'.

It's grammatically correct but sounds very robotic. Imagine someone saying 'I' in every single English sentence. It's better to omit it when possible.

'wa' introduces a topic, while 'ga' focuses on the subject. For now, stick to wa for general statements.

Most people pronounce it as 'dess'. The 'u' at the end is very soft or silent in standard Japanese.

No, this pattern only means 'is'. For 'have', you need a different grammar point entirely.

Yes, it is perfectly polite for everyday professional life. You won't offend anyone with this.

'kore' means 'this thing near me'. It is a common 'A' in the A wa B desu pattern.

Yes, you can say koko wa gakkou desu (Here is school). It defines the space.

'da' is the casual version. Only use it with friends or family, otherwise you might sound a bit rude.

The 'ne' is like saying 'right?' or 'isn't it?'. It seeks agreement from the listener.

Yes, just add jin (person) to your country name. watashi wa amerika-jin desu.

The sentence will sound like a list of words. watashi... Tanaka... desu. People might understand, but it sounds very broken.

No! desu stays the same whether you are talking about one person or a hundred people. One less thing to memorize!

No, never put desu directly after a plain verb like taberu. Verbs have their own polite endings like tabemasu.

All the time! But characters in anime often use very casual versions like dropping the ending entirely. Learn the polite way first!

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