Plain Form + Noun | Japanese Grammar Documentation

What is Plain Form + Noun?

Plain form + noun is the basic pattern for modifying nouns in Japanese. Verbs and adjectives must be in their plain (dictionary) form when directly modifying a noun - never the polite ます/です forms. This is the foundation of noun modification in Japanese.

食べる人
"A person who eats"

赤い車
"A red car"

昨日買った本
"The book (I) bought yesterday"

Basic Structure

[Plain form] + Noun

読む + 本 → 読む本
"A book to read"

高い + 車 → 高い車
"An expensive car"

Direct modification
No particles between

Verb Forms

Dictionary form (present/future)

食べる人
"A person who eats / will eat"

行く場所
"A place to go"

Present or future action

た-form (past)

食べた人
"A person who ate"

行った場所
"A place (I) went"

Past action

ない-form (negative)

食べない人
"A person who doesn't eat"

行かない場所
"A place (I) don't go"

Negative action

ている-form (continuous/state)

走っている人
"A person who is running"

開いている店
"A store that is open"

Ongoing state or action

Adjective Forms

い-adjectives (plain form)

高い山
"A tall mountain"

新しい本
"A new book"

白い犬
"A white dog"

Direct modification

な-adjectives (with な)

静かな場所
"A quiet place"

便利な道具
"A convenient tool"

きれいな花
"A pretty flower"

な connects to noun

Position

Modifier before noun

[私が読んだ] 本
"[The book I read]"

[昨日買った] 服
"[The clothes (I) bought yesterday]"

Clause comes first
Noun comes last

Polite vs Plain

ALWAYS use plain in modification

Wrong: 読みます本 ⚠️
Correct: 読む本 ✓
"A book to read"

Never use polite form
Even in polite sentences

Main sentence can be polite

これは私が読んだ本です
"This is the book I read" (polite)

Modifier: plain (読んだ)
Final verb: polite (です)

Particle Usage in Clauses

Particles stay in modifier

私が読んだ本
"The book that I read"

が marks subject

を for objects

私が買った物
"The thing I bought"

を can be omitted

で/に for location

東京にある店
"A store in Tokyo"

私が住んでいる家
"The house where I live"

Location marked

Tense in Modification

Present tense modifier

食べる人
"A person who eats"

Habitual or future

Past tense modifier

食べた人
"A person who ate"

Completed action

Multiple Modifiers

Stacking modifiers

昨日私が買った新しい本
"The new book I bought yesterday"

Multiple clauses possible
All in plain form

Order of modifiers

[Relative clause] + [Adjective] + Noun

彼が作った美味しい料理
"The delicious food he made"

Clauses before simple adjectives

Common Patterns

Person descriptions

日本語を話す人
"A person who speaks Japanese"

メガネをかけている人
"A person wearing glasses"

Identifying people

Place descriptions

静かな場所
"A quiet place"

人が多い店
"A store with many people"

Location qualities

Object descriptions

私が好きな音楽
"Music that I like"

高くて美味しい料理
"Food that's expensive and delicious"

Thing characteristics

Time Expressions

彼が来た時
"The time when he came"

雨が降る日
"A day when it rains"

Temporal modification

Subject Markers

が in relative clauses

彼が書いた本
"The book that he wrote"

私が住んでいる町
"The town where I live"

が preferred over は

Omitting Information

Context-based omission

Full: 私が食べたりんご
"The apple I ate"

Short: 食べたりんご
"The eaten apple"

Subject often dropped

Common Contexts

Shopping and choosing

これは昨日買った服です
"These are the clothes I bought yesterday"

欲しい物がある
"There's something I want"

Describing items

Introducing people

これは私が作った料理です
"This is food I made"

あの走っている人は友達です
"That person running is my friend"

Identification

Making recommendations

私がよく行くレストラン
"A restaurant I often go to"

友達が教えてくれた場所
"A place my friend told me about"

Suggestions

Common Mistakes

Using polite forms

Wrong: 読みました本 ⚠️
Wrong: 高いです車 ⚠️
Correct: 読んだ本 ✓
Correct: 高い車 ✓

Must use plain

Forgetting な with な-adjectives

Wrong: 静か場所 ⚠️
Correct: 静かな場所 ✓
"A quiet place"

な required

Using は in relative clauses

Wrong: 私は読んだ本 ⚠️
Correct: 私が読んだ本 ✓
"The book I read"

Use が, not は

Adding の unnecessarily

Wrong: 赤いの車 ⚠️
Correct: 赤い車 ✓
"A red car"

Direct modification
No の needed

Negative Modifiers

ない-form before nouns

食べない人
"A person who doesn't eat"

好きじゃない食べ物
"Food I don't like"

Negative descriptions

Complex Modifications

Long modifier clauses

私が昨日図書館で借りた本
"The book I borrowed at the library yesterday"

Full clauses possible
All plain form

Practice Sentences

Basic

読む本
"A book to read"

高い車
"An expensive car"

静かな場所
"A quiet place"

食べた人
"A person who ate"

走っている人
"A person who is running"

Intermediate

私が昨日買った新しい服はとても高かった
"The new clothes I bought yesterday were very expensive"

彼が住んでいるアパートは駅から遠い
"The apartment where he lives is far from the station"

母が作ってくれた料理を食べた
"I ate the food my mother made for me"

日本語を勉強している友達がたくさんいます
"I have many friends who are studying Japanese"

東京にある大きい店で買い物をした
"I shopped at a big store in Tokyo"