Japanese Relative Clauses: How to Modify Nouns in Japanese

In English, you say “the book that I read” — the noun comes first, and the describing clause follows it. Japanese works in exactly the opposite direction. You say 私が読んだ本（わたしがよんだほん）, which places the entire modifying clause before the noun. For English speakers, this reversal is one of the most disorienting moments in learning Japanese — and also one of the most rewarding to master. Once you understand how Japanese noun-modifying clauses work, long, complex sentences suddenly become readable.

The Basic Rule: Modifiers Always Come Before the Noun

The single most important thing to understand about Japanese noun modification is this: everything that describes a noun goes before that noun. This applies whether the modifier is a single adjective, a long verb clause, or an entire mini-sentence.

Compare English and Japanese side by side:

Notice that in Japanese, there is no word equivalent to “that,” “who,” or “where” introducing the clause. The clause simply sits directly before the noun it describes. This is why beginners often feel they are reading Japanese sentences backwards — because structurally, they are, compared to English.

Key insight: Japanese has no relative pronoun. Instead, the modifying clause takes plain (dictionary) form and attaches directly to the noun. The noun being modified is called the head noun.

Yuka

So when I want to say “the movie that Rei recommended,” I just put the whole clause before the noun? Like, レイが勧めた映画（すすめたえいが）?

Rei

Exactly! レイが勧めた映画 — “the movie [that] Rei recommended.” No extra word needed between the clause and the noun. You’ve got it!

Verb Clauses Modifying Nouns

Verbs used inside a noun-modifying clause must be in plain form (also called dictionary form or casual form). This applies to all tenses and polarities. Here is how the four main verb forms work as modifiers:

Example sentences:

1. 毎日コーヒーを飲む人は多い。（まいにちコーヒーをのむひとはおおい。）
There are many people who drink coffee every day.

2. 昨日買った本はとても面白い。（きのうかったほんはとてもおもしろい。）
The book I bought yesterday is very interesting.

3. 肉を食べない人のために、野菜料理も用意しました。（にくをたべないひとのために、やさいりょうりもようしました。）
I also prepared vegetable dishes for people who don’t eat meat.

The が→の Alternation Inside Relative Clauses

This is one of the trickiest points for learners. Inside a noun-modifying clause, the subject marker が（ga）can be replaced by の（no）. Both are grammatically correct, but の sounds slightly more literary or formal.

4. 私が書いた手紙 = 私の書いた手紙（わたしのかいたてがみ）
the letter that I wrote

5. 先生が教えた文法 = 先生の教えた文法（せんせいのおしえたぶんぽう）
the grammar that the teacher taught

Note: This の substitution only applies inside a noun-modifying clause. Outside of one, が and の play entirely different roles and cannot be swapped.

Adjective Clauses: い-Adjectives, な-Adjectives, and Stacking

Adjectives in Japanese already attach directly to nouns without any extra connector — which means you have been using noun modification since your very first lesson without even realising it.

い-adjectives connect directly to the noun:

6. 高い本（たかいほん） — an expensive book
安い店（やすいみせ） — a cheap shop
難しい問題（むずかしいもんだい） — a difficult problem

な-adjectives require な before the noun:

7. きれいな人（きれいなひと） — a beautiful / clean person
便利な場所（べんりなばしょ） — a convenient place
有名な店（ゆうめいなみせ） — a famous shop

Stacking modifiers: You can layer multiple modifiers before a single noun, just as in English (“a small, old, red book”). In Japanese, each modifier simply precedes the next:

8. 安くておいしいラーメン屋（やすくておいしいラーメンや） — a cheap and delicious ramen shop
(Note: い-adjectives use the て-form 〜くて to connect to the next adjective.)

Yuka

Can I stack a verb clause AND an adjective before one noun? Like “the expensive book I bought”?

Rei

Yes! You can say 買った高い本（かったたかいほん）— “the expensive book [that I] bought.” The verb clause 買った and the adjective 高い both go before 本. Just keep the most specific modifier closest to the noun.

の as Nominalizer vs. Modifier vs. Possessive

The particle の（no）appears in three different roles in Japanese, and confusing them is extremely common. Here is a clear breakdown:

Nominalizer in detail: When の follows a plain-form verb or adjective and is then followed by a particle (が, を, は, etc.), it turns the entire preceding expression into a noun phrase. This is different from noun modification.

9. 日本語を話すのは難しい。（にほんごをはなすのはむずかしい。）
Speaking Japanese is difficult. (の turns “speak Japanese” into a noun: “the act of speaking Japanese”)

10. 彼女が歌うのを聞いた。（かのじょがうたうのをきいた。）
I heard her singing. (の turns “she sings” into a noun: “her singing”)

Contrast this with noun modification: 彼女が歌った歌（かのじょがうたったうた） — “the song that she sang” — where the clause modifies the head noun 歌, and no の appears between the clause and the noun.

Common Structures in Real Japanese

Once you understand the basic rule, you will start spotting noun-modifying clauses everywhere in natural Japanese. Here are the most frequent patterns you will encounter:

〜ている + noun (describing an ongoing action or state)

11. あそこで歩いている人は誰ですか。（あそこであるいているひとはだれですか。）
Who is that person walking over there?

12. 東京に住んでいる友達に会いました。（とうきょうにすんでいるともだちにあいました。）
I met a friend who lives in Tokyo.

〜た + もの / こと / 人 (person / thing / fact)

13. 先週買ったものをなくしてしまった。（せんしゅうかったものをなくしてしまった。）
I lost the thing I bought last week.

14. 彼が言ったことを覚えていますか。（かれがいったことをおぼえていますか。）
Do you remember what he said?

Place + で + Verb + Noun (something done at a place)

15. 図書館で借りた本はもう読みました。（としょかんでかりたほんはもうよみました。）
I already read the book I borrowed from the library.

Yuka

I just said to my host family, 昨日公園で食べたおにぎりはおいしかった（きのうこうえんでたべたおにぎりはおいしかった）, and they understood me perfectly! Using a whole clause before a noun feels natural now.

Rei

That’s a great sentence! 昨日公園で食べたおにぎり — “the rice ball I ate at the park yesterday.” You just used a place phrase, a time word, AND a verb clause all before one noun. That’s advanced-level thinking!

Common Mistakes to Avoid

Even intermediate learners make these errors repeatedly. Being aware of them will save you a lot of confusion.

Mistake 1: Keeping the English word order
❌ 本 私が読んだ（ほん わたしがよんだ）
✅ 私が読んだ本（わたしがよんだほん）
In Japanese, the modifier ALWAYS goes before the noun. There is no exception to this rule.

Mistake 2: Adding a relative pronoun (“that,” “who,” “which”)
❌ 私が読んだこと本 (inserting a connector like English “that”)
✅ 私が読んだ本（わたしがよんだほん）
Japanese uses no relative pronoun. The clause connects directly to the noun.

Mistake 3: Using masu-form inside the relative clause
❌ 毎日食べます人（まいにちたべますひと）
✅ 毎日食べる人（まいにちたべるひと）
The verb inside a noun-modifying clause must be in plain form (dictionary form, た-form, ない-form, or なかった-form). Polite masu-form does NOT work here.

Mistake 4: Confusing が and の inside modifier clauses
Learners sometimes avoid の as a subject marker inside relative clauses because they only know の as “possessive.” In fact, inside a noun-modifying clause, switching が to の is completely natural:
私が作ったケーキ = 私の作ったケーキ（わたしのつくったケーキ）— both mean “the cake I made.”
Outside a relative clause, の cannot replace が as a subject marker.

Mistake 5: Overusing の as a connector everywhere
❌ 食べるの人（たべるのひと）
✅ 食べる人（たべるひと）
の is NOT inserted between a verb clause and its head noun. Verb (plain form) attaches directly to the noun. Only な-adjectives need an extra connector (な).

Quick Quiz

Test what you have learned. Choose the correct Japanese expression for each English phrase.

Question 1: “the student who studies every day”
A. 学生毎日勉強する　B. 毎日勉強する学生　C. 毎日勉強します学生

Answer: B — 毎日勉強する学生（まいにちべんきょうするがくせい）. The plain-form clause goes before the noun. A has the wrong word order; C uses masu-form (wrong inside a modifier clause).

Question 2: “the movie I watched yesterday” — fill in the blank: 昨日___映画（えいが）

Answer: 昨日見た映画（きのうみたえいが）— Use the た-form (past plain form) of 見る（みる）.

Question 3: Which sentence means “I like reading books”?
A. 本を読むのが好きです。　B. 本を読むが好きです。　C. 本が読むのです。

Answer: A — 本を読むのが好きです。（ほんをよむのがすきです。）の nominalizes the verb phrase 本を読む, turning it into a noun (“the act of reading books”) that can take the particle が.

Question 4: Translate into Japanese: “a convenient place where we can study”

Answer: 勉強できる便利な場所（べんきょうできるべんりなばしょ）— The verb clause 勉強できる and the な-adjective 便利な both go before the head noun 場所.

Question 5: True or false: Inside a noun-modifying clause, が can be replaced by の.
Answer: True. For example, 彼が書いた手紙 and 彼の書いた手紙（かれのかいたてがみ）are both correct and mean “the letter he wrote.” The の version sounds slightly more literary.

How did you do? Share your results and any questions in the comments below — we read every one!

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About the Author

Daisuke is the creator of JP YoKoSo — a Japanese learning site for English speakers. Every article is written to explain Japanese clearly, with real examples, grammar notes, and practical tips for learners at every level.

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