JLPT N5 Grammar: Japanese Noun Fundamentals — Parts of Speech, Core Patterns & の Explained

Before you can build sentences in Japanese, you need to understand the building blocks. This article covers the first and most essential chapter of N5 grammar: nouns and how they work in sentences.

We start with a bird’s-eye view of Japanese parts of speech, then work through five core grammar points that form the foundation of everything you will encounter in the N5 exam — and in real Japanese.

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Table of Contents

1. Japanese Parts of Speech — The Big Picture
2. ～は～です — The Basic Noun Sentence
3. ～で～ — Connecting Two Noun Sentences
4. ～の～ — Noun Modifying Noun
5. Noun Modifiers (連体修飾語)
6. Using の in Place of が Inside Noun Clauses

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1. Japanese Parts of Speech — The Big Picture

Every word in Japanese belongs to a part of speech (品詞 / ひんし, hinshi). There are ten main categories, and knowing their names will help you follow grammar explanations as you study — both here and in any textbook.

The Ten Parts of Speech

Part of Speech	Japanese	Reading	What It Does
Verb	動詞	どうし	Expresses actions, states, or existence
Noun	名詞	めいし	Names things, people, places, concepts
Adjective (i-type)	形容詞	けいようし	Describes quality or state; ends in い
Adjectival noun (na-type)	形容動詞	けいようどうし	Also describes quality; behaves like a noun
Adverb	副詞	ふくし	Modifies verbs, adjectives, or other adverbs
Prenominal modifier	連体詞	れんたいし	Modifies nouns only; e.g. この, その, あの
Conjunction	接続詞	せつぞくし	Links sentences or clauses
Interjection	感動詞	かんどうし	Expresses emotion or response
Auxiliary verb	助動詞	じょどうし	Attaches to verbs/adjectives to add meaning
Particle	助詞	じょし	Shows relationships between words

You do not need to memorise all of these right now. But as you progress through N5, you will encounter these terms repeatedly — especially particle (助詞), auxiliary verb (助動詞), verb (動詞), and the two adjective types. Knowing what these labels mean will make grammar explanations click much faster.

Conjugating Words vs Non-Conjugating Words

One important distinction in Japanese grammar is whether a word conjugates (changes its ending depending on tense, negation, formality) or not.

Words that conjugate are called 用言 (ようげん / yōgen). These are verbs, adjectives, and adjectival nouns. For example, the verb 食べる (taberu, to eat) changes to 食べます, 食べない, 食べた, and so on depending on how it is used.

Words that do not conjugate are called 体言 (たいげん / taigen). Nouns are the main example — 学生 (gakusei, student) stays the same regardless of the sentence around it.

This distinction matters because much of Japanese grammar is about how conjugating words connect to each other and to non-conjugating words.

Quick Reference: Examples of Each Part of Speech

Part of Speech	Example	Reading	Meaning
Verb	買う	かう	to buy
Adjective (i-type)	寒い	さむい	cold
Adjectival noun (na-type)	賑やか	にぎやか	lively, bustling
Noun	学生、桜、私、会社	がくせい、さくら、わたし、かいしゃ	student, cherry blossom, I, company
Adverb	とても、すぐ、もっと	—	very, immediately, more
Prenominal modifier	この家、その会社	このいえ、そのかいしゃ	this house, that company
Conjunction	そして、しかも	—	and then, moreover
Interjection	ね、ほら、はい	—	right?, look!, yes
Auxiliary verb	遊びたい	あそびたい	want to play
Particle	彼は図書館で本を読んでいる	かれはとしょかんでほんをよんでいる	He is reading a book at the library

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2. ～は～です — The Basic Noun Sentence

Pattern: Noun + は + Noun + です

This is the very first sentence structure most learners encounter, and it is also the single most important pattern in N5. It means “X is Y.”

私は学生です。
Watashi wa gakusei desu.
I am a student.

あの方は先生です。
Ano kata wa sensei desu.
That person is a teacher.

What Is は?

は is a particle (助詞). In this pattern, は marks the topic of the sentence — the thing you are making a statement about. Everything after は is the comment or description of that topic.

One important note on pronunciation: when は functions as a particle, it is always pronounced wa, not ha.

What Is です?

です is an auxiliary verb (助動詞) — specifically a copula, which makes an affirmative statement about the topic. It is often translated simply as “is/am/are,” but its real job is to assert that the description is true.

です belongs to a formal register called 丁寧体 (ていねいたい / teineita), which is the polite style of Japanese. The plain/casual equivalent is だ.

Formal vs Casual — Two Registers of Japanese

Japanese has two main registers that learners need to know:

Formal style (丁寧体 / teineita) — used with strangers, superiors, in class, and in writing where you have an audience. Uses です, ます, etc.

Casual style (普通体 / futsūtai) — used with close friends, family, or in private writing like a diary. Uses だ and plain verb forms.

⚠️ Once you choose a style for a piece of writing or a conversation, stick to it throughout. Mixing formal and casual mid-sentence is a very common beginner mistake.

Tense and Negation Table

The pattern ～は～です has four key forms:

	Formal (丁寧体)	Casual (普通体)
Present affirmative	私は学生です。 I am a student.	私は学生だ。
Present negative	私は先生ではありません。 I am not a teacher.	私は先生ではない。
Past affirmative	昨日は月曜日でした。 Yesterday was Monday.	昨日は月曜日だった。
Past negative	昨日は火曜日ではありませんでした。 Yesterday was not Tuesday.	昨日は火曜日ではなかった。

Negative Variations

For the negative, there are several equivalent expressions. From most formal to most casual:

Formal: ではありません = じゃありません = ではないです = じゃないです
Casual: ではない = じゃない

All of these mean the same thing — “is not.” The shorter and more contracted forms are more casual.

Asking Questions

To turn a formal sentence into a question, simply add か to the end and raise your intonation. The か particle functions like a question mark spoken aloud.

あなたは学生ですか。
Are you a student?

はい、学生です。 — Yes, I am a student.
いいえ、学生ではありません。 — No, I am not a student.

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3. ～で～ — Connecting Two Noun Sentences

Pattern: Noun + で + (next clause)

Once you know the basic ～は～です sentence, the next step is learning how to link two sentences together into one. That is the job of で in this context.

で here is the connective form (中止形 / ちゅうしけい) of the copula だ. Think of it as pausing the first sentence before continuing with the next one.

私は学生で、先生ではありません。
Watashi wa gakusei de, sensei dewa arimasen.
I am a student, (and) I am not a teacher.

私は学生で、小田君は学生ではありません。
Watashi wa gakusei de, Oda-kun wa gakusei dewa arimasen.
I am a student, and Oda is not.

Two Types of Connected Sentences

When joining sentences with で, the relationship between the two halves falls into one of two categories:

Consecutive description (連続敘述) — both halves share the same topic. Because the topic is the same, it can be dropped in the second half.

私は学生です。私は先生ではありません。(two sentences)
↓ combined with で:
私は学生で、先生ではありません。(one sentence — 私 dropped from second half)

Contrasting description (相対敘述) — the two halves have different topics. Because the topics differ, both must be stated explicitly.

私は学生です。小田君は学生ではありません。(two sentences)
↓ combined with で:
私は学生で、小田君は学生ではありません。(one sentence — both topics kept)

Tense with で

The で form does not carry tense on its own. Tense is determined by the final clause of the sentence.

今は学生で、二十歳です。(present)
Right now I am a student and twenty years old.

その時は学生で、二十歳でした。(past)
At that time I was a student and twenty years old.

Negative Connector

When the first clause is negative and you want to connect it to another clause, use ではなくて instead of で:

私は学生ではなくて、先生です。
I am not a student — I am a teacher.

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4. ～の～ — Noun Modifying Noun

Pattern: Noun + の + Noun

の is one of the most frequently used particles in Japanese. In this pattern, it connects two nouns, roughly equivalent to the English word “of” or the possessive “‘s” — but its range of meaning is actually much wider.

私の本 — my book
リンゴの皮 — apple skin
日本語の教科書 — Japanese language textbook

Notice that not all of these translate as “of” or “‘s” in natural English. The key idea is that の shows a relationship between two nouns. The type of relationship depends on context.

The Many Uses of の

の between two nouns can express several different types of relationships. You do not need to consciously identify which type you are using — just recognise that の is flexible, and that its translation in English will vary.

Possession — the first noun owns the second:

• 私の本 — my book
• 彼の携帯電話 — his mobile phone

Part-whole — the second noun is a part of the first:

• リンゴの皮 — the skin of the apple (apple skin)
• 椅子の脚 — the leg of the chair (chair leg)

Material — what something is made of:

• 木の棚 — a wooden shelf
• ガラスのコップ — a glass cup

Relationship — personal connections:

• 姉の友達 — my older sister’s friend
• 田中さんの上司 — Tanaka-san’s boss

Category / type — what kind of thing something is:

• 家電のリサイクル — recycling of home appliances
• 果物の箱 — a box of fruit

Time — when something happens:

• 朝の訓練 — morning training
• スポーツの後 — after sport

Place — where something is from or belongs:

• 日本の天気 — Japan’s weather

Quantity — number or amount:

• 五人の学生 — five students
• 三匹の犬 — three dogs

Content — what something is about or contains:

• 日本語の教科書 — a Japanese language textbook
• 経済の話 — a topic about economics

Apposition (同位格 / どういかく) — both nouns refer to the same person, where the first noun is a title or role:

• 友人の田中さん — my friend Tanaka-san
• 課長の林さん — Section Chief Hayashi

の as a Noun Substitute (準体助詞)

の also has a second major use: it can replace a noun that was already mentioned to avoid repetition. This is called the quasi-nominal particle (準体助詞 / じゅんたいじょし).

このノートパソコンはあなたのですか。
Is this laptop yours?
(Full form: あなたのノートパソコン → の replaces ノートパソコン)

そのバイクは私のです。
That motorbike is mine.

この本は誰のですか。
Whose book is this?

This works just like English — “Is this yours?” rather than “Is this your laptop?” The の holds the place of the noun so you do not have to repeat it.

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5. Noun Modifiers (連体修飾語)

Pattern: Modifier + Noun

Before learning more about particles, it is useful to understand the concept of noun modifiers (連体修飾語 / れんたいしゅうしょくご). These are words or phrases that come before a noun and describe it.

In Japanese, modifiers always come before the noun they describe — unlike in English, where descriptive clauses can come after (“the man who runs”). In Japanese, it is always “the running man” order.

There are two kinds of noun modifiers:

Prenominal Words (連体詞 / れんたいし)

These are words that exist solely to modify nouns. The most important ones for N5 are:

Word	Reading	Meaning
この	kono	this (near the speaker)
その	sono	that (near the listener)
あの	ano	that over there (away from both)
どの	dono	which

Examples:

• この人 — this person
• その子供 — that child
• あのレストラン — that restaurant over there

Conjugated Forms Modifying Nouns (連体形 / れんたいけい)

Verbs, adjectives, and adjectival nouns can also modify nouns directly when they are in their attributive form (連体形). This is what allows Japanese to build complex descriptive phrases.

Type	Modifier	Noun	Full Phrase	Meaning
Verb	走る	人	走る人	a person who runs / a running person
Adjective (i-type)	おいしい	料理	おいしい料理	delicious food
Adjectival noun (na-type)	綺麗な	花	綺麗な花	a beautiful flower
Noun + の	私の	本	私の本	my book

Notice the pattern for na-type adjectives: they use な before a noun (綺麗な花), not just 綺麗. This な is part of the attributive form. This is different from い-adjectives, which do not need any connector (おいしい料理, not おいしいな料理).

Summary Table: How Different Word Types Modify Nouns

Word Type	How to Connect	Example	Meaning
Noun	Noun + の + Noun	私の本	my book
Prenominal word	Word + Noun	この本	this book
Verb	Dictionary form + Noun	売れる本	a bestselling book
Adjective (i-type)	Plain form + Noun	厚い本	a thick book
Adjectival noun (na-type)	Stem + な + Noun	綺麗な本	a beautiful book

The key takeaway: in Japanese, modifiers always precede the noun, and each word type has its own way of connecting.

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6. Using の in Place of が Inside Noun Clauses

Pattern: Noun + の + modifier + Noun

This is a slightly more advanced point, but it appears in N5 and is worth understanding clearly.

When a modifier phrase describes a noun (forming what is called a noun modification clause, or 連体修飾節), the subject marker が inside that clause can optionally be replaced with の.

Examples

母が作ったケーキ → 母の作ったケーキ
haha ga tsukutta kēki → haha no tsukutta kēki
the cake that (my) mother made

目が大きい犬 → 目の大きい犬
me ga ōkii inu → me no ōkii inu
a dog with big eyes

あなたが好きな人 → あなたの好きな人
anata ga suki na hito → anata no suki na hito
the person you like

In all three cases, が and の are interchangeable within the modifying clause. The meaning does not change.

Why Does This Happen?

In classical Japanese, が and の overlapped in certain functions — including marking the subject. This overlap survives in modern Japanese specifically inside noun modification clauses. It is a grammatical fossil, not a coincidence.

The replacement is optional — either が or の is grammatically correct inside these clauses. However, の tends to feel slightly more natural in speech, which is why you will encounter it frequently.

The Same Swap Works for Object が

This substitution also applies when が marks the object of a predicate adjective inside a modifier clause:

英語が得意な人 → 英語の得意な人
a person who is good at English

海が見える席 → 海の見える席
a seat where you can see the ocean

Quick Reference Summary

Original (with が)	Alternative (with の)	Meaning
母が作ったケーキ	母の作ったケーキ	the cake my mother made
目が大きい犬	目の大きい犬	a dog with big eyes
あなたが好きな人	あなたの好きな人	the person you like
英語が得意な人	英語の得意な人	a person good at English
海が見える席	海の見える席	a seat with an ocean view

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Putting It All Together

The six concepts covered in this article build on each other in a logical chain:

1. Parts of speech give you the vocabulary to understand grammar explanations
2. ～は～です gives you the basic sentence structure for making statements
3. ～で～ lets you chain two noun sentences together
4. ～の～ lets you connect two nouns to show relationships
5. Noun modifiers teach you how to describe nouns with adjectives, verbs, and other nouns
6. の replacing が shows you a common and natural variation you will see in authentic Japanese

Together, these form the complete foundation of how nouns work in Japanese. Every N5 grammar point you study from here builds on this base — verb sentences, adjective patterns, location expressions, tense markers — all rely on your understanding of how nouns function.

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Quick Concept Reference Card

Concept	Pattern	Example	Meaning
Basic noun sentence	N + は + N + です	私は学生です	I am a student
Past	N + は + N + でした	昨日は月曜日でした	Yesterday was Monday
Negative	N + は + N + ではありません	私は先生ではありません	I am not a teacher
Question	N + は + N + ですか	あなたは学生ですか	Are you a student?
Connecting sentences	N + で + (next clause)	私は学生で、先生ではありません	I’m a student, not a teacher
Noun + noun	N + の + N	私の本	my book
Noun substitute	N + の (noun omitted)	それは私のです	That one is mine
Prenominal modifier	この/その/あの + N	この本	this book
い-adj modifying noun	adj + N	おいしい料理	delicious food
な-adj modifying noun	adj-stem + な + N	綺麗な花	beautiful flower
が → の swap (noun clause)	N + の + modifier + N	母の作ったケーキ	the cake my mother made

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Continue Learning

Practice the vocabulary and grammar you’ve learned in this article with Nihongomachi’s free flashcards — covering all 127 N5 vocabulary words and 20 grammar patterns with spaced repetition built in.

For the words you’ll need alongside these grammar patterns, see our JLPT N5 Vocabulary List. For a full overview of the exam format and what N5 tests, read our Complete JLPT N5 Guide. Ready to make a study schedule? See our JLPT N5 Study Plan.

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This grammar guide is produced by Nihongomachi for English-speaking JLPT N5 learners. Grammar terminology follows standard Japanese language education conventions. Example sentences are original.