N4Chapter 34

Relative Clauses (Noun Modification)

Learning Objectives

  • Understand the structure and word order of relative clauses in Japanese compared to English.
  • Use plain form verbs and adjectives to modify nouns.
  • Master the particle change from は to が inside a relative clause.
  • Form complex descriptive sentences.
N4 · Context

In English, if we want to describe a noun using an entire action, we use words like “who,” “which,” or “that” after the noun. For example: “The book that I bought yesterday.” In Japanese, it is entirely reversed! The descriptive clause acts just like a simple adjective and comes before the noun: “I-bought-yesterday book.” This structure is called a Relative Clause (連体修飾 - rentai shuushoku).

1. Basic Structure

To make a relative clause, simply put an entire sentence into the Plain Form (dictionary form, ta-form, nai-form, etc.) and stick it directly in front of the noun you want to describe.

  • Sentence: 日本で買いました (I bought in Japan)
  • Noun: 時計 (Watch)
  • Relative Clause: [日本で買った] 時計 (The watch [that I bought in Japan])
Grammar Point
[Plain Form Modifying Clause] + Noun
MeaningThe [Noun] that/who [Modifying Clause].
Formation
Verb-Plain/Adj-Plain + Noun
Examples (3)

これは私が書いた本です。

kore wa watashi ga kaita hon desu.

This is the book that I wrote.

東京行きの電車に乗る人は、こちらへ来てください。

toukyou yuki no densha ni noru hito wa, kochira e kite kudasai.

The people who will ride the Tokyo-bound train, please come this way.

美味しくないケーキは食べたくないです。

oishikunai keeki wa tabetakunai desu.

I do not want to eat cake that is not delicious.

2. The Critical Particle Rule (は ➔ が)

This rule is a major stumbling block for learners: Inside a relative clause, the subject particle は MUST change to が (or occasionally の).

Why? Because は marks the topic for the entire main sentence. If you force a は inside a tiny descriptive bubble, it breaks the sentence’s balance.

  • Main Sentence Subject: 田中さんは (Tanaka is…)
  • Incorrect Relative Clause: [ 田中さんは作った ] ケーキ
  • Correct Relative Clause: [ 田中さんが作った ] ケーキ (The cake that Tanaka made)

私が昨日見た映画はとても面白かったです。

watashi ga kinou mita eiga wa totemo omoshirokatta desu.

The movie [that I saw yesterday] was very interesting.

[!NOTE] In written or slightly formal Japanese, the が inside a relative clause is often replaced with の. For example: 私の書いた本 (The book that I wrote). 私の here does not mean “my book”, it means I am the subject who did the action inside the clause!

3. Placement in the Main Sentence

The incredible thing about a relative clause is that, mathematically, it is just a giant Noun. You can put this giant block anywhere a normal noun can go—as the subject, object, or location!

  • As the Subject (が/は): [私が昨日見た映画] は 面白かったです。(The movie I saw yesterday was interesting).
  • As the Direct Object (を): [山田さんが住んでいるアパート] を 探しています。(I am looking for the apartment where Yamada lives).
  • As the Location (で/に): [初めて会ったレストラン] で 食事をしましょう。(Let’s eat a meal at the restaurant where we first met).

Contextual Dialogue

Let’s see Tanaka and Suzuki describing people and things using relative clauses at a party.

At the Party (パーティーにて)
S
Suzuki

田中さん、あの赤いドレスを着ている人は誰ですか。

Tanaka-san, ano akai doresu o kite iru hito wa dare desu ka.

Tanaka-san, who is the person wearing the red dress?

T
Tanaka

あそこの人ですか。あの人は先月会社に入った山田さんですよ。

Asoko no hito desu ka. Ano hito wa sengetsu kaisha ni haitta Yamada-san desu yo.

The person over there? That is Yamada-san, who joined the company last month.

S
Suzuki

あ、山田さんですね。ところで、さっき買ったケーキ、美味しいですね。

A, Yamada-san desu ne. Tokorode, sakki katta keeki, oishii desu ne.

Oh, she is Yamada-san. By the way, the cake we bought earlier is delicious, isn't it?

T
Tanaka

ええ。駅の近くにある有名な店のケーキです。

Ee. Eki no chikaku ni aru yuumei na mise no keeki desu.

Yes. It's from a famous shop near the station.

S
Suzuki

私も山田さんが持ってきたクッキーを買いたかったです。

Watashi mo Yamada-san ga motte kita kukkii o kaitakatta desu.

I also wanted to buy the cookies (that) Yamada-san brought.

Chapter Summary

Key Takeaways
  • 1Relative clauses describe a noun using an entire sentence.
  • 2In Japanese, the descriptive clause ALWAYS goes directly IN FRONT of the noun it modifies.
  • 3The modifying verb or adjective MUST be in the Plain Form (e.g., dictionary form, ta-form).
  • 4Inside the modifying clause, the subject particle は MUST change to が (or の).
  • 5The resulting [Clause + Noun] phrase acts as a single giant noun within the main sentence.

Knowledge Check

Test your understanding of Relative Clauses!

🧩

Quiz

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Where does the modifying clause go in relation to the noun it describes in Japanese?