Relative Clauses (Noun Modification)

In Japanese, modifying a noun with a verb or a clause (similar to English relative clauses like "the book that I read") is done simply by placing the modifying clause directly before the noun. There are no relative pronouns like "who," "which," or "that" in Japanese.

The basic rule is that the verb ending the modifying clause must be in its plain form (dictionary form, past plain, or negative plain, e.g., yomu, yonda, yomanai). This clause directly precedes the modified noun. If there is a subject inside the modifying clause, its subject marker particle は (wa) must change to が (ga) or の (no) (e.g., Tanaka-san ga katta hon - the book that Mr. Tanaka bought).

A major mistake for learners is trying to translate English relative pronouns into Japanese (e.g., trying to use kore or sore in the middle of the sentence). Another common error is using polite verb forms (like yomimasu) inside the modifying clause, which is grammatically incorrect in standard relative clauses. Ensure the verb directly before the noun is strictly in its plain form.