Translation guide
The genitive case in English expresses possession, association, or a relationship between two nouns. Japanese does not have a case system like English; instead, it uses the particle の (no) to link nouns, along with other structures depending on the meaning.
Indicate that something belongs to someone or something.
The particle の links two nouns, where A possesses B. This is the most common way to express the genitive in Japanese.
これは私の本です。
This is my book.
田中さんの車は新しい。
Tanaka's car is new.
Show a relationship between two entities, such as a person and their school, company, or family member.
の also expresses non-possessive relationships, like 'my friend' or 'the company's president'.
彼は私の友達です。
He is my friend.
あの人は会社の社長です。
That person is the company's president.
Describe a characteristic, type, or material of something.
の can connect a descriptive noun to another noun, similar to 'of' or an adjective in English.
これは木の机です。
This is a wooden desk.
彼は英語の先生です。
He is an English teacher.
Express that something is a part of a larger whole, or the content of something.
の indicates that B is a part or member of A, like 'the leg of the table' or 'a group of students'.
机の脚が折れた。
The leg of the desk broke.
学生のグループが来た。
A group of students came.
Specify a location or time in relation to something else.
の can connect a location or time word to a noun, like 'Tokyo's weather' or 'today's news'.
東京の天気はどうですか。
How is Tokyo's weather?
今日の新聞を読みましたか。
Did you read today's newspaper?
Clarify or rename a noun, like 'the city of Kyoto' or 'the problem of pollution'.
の can be used where two nouns refer to the same thing, often translated as 'of' or an appositive in English.
京都の町は美しい。
The city of Kyoto is beautiful.
汚染の問題は深刻だ。
The problem of pollution is serious.
Show the subject or object of an action within a noun phrase, like 'the arrival of the train' or 'the love of music'.
When B is a verbal noun (like 到着 'arrival' or 愛 'love'), の can mark the subject or object, depending on context.
電車の到着を待っている。
I'm waiting for the arrival of the train.
音楽の愛は世界共通だ。
The love of music is universal.
Refer to something belonging to someone without repeating the noun, like 'mine' or 'Tanaka's'.
The particle の can be used without a following noun when the noun is understood from context, similar to English possessive pronouns.
これは私のです。
This is mine.
その傘は田中さんのですか。
Is that umbrella Tanaka's?
While の is versatile, long chains of の can sound awkward. Try to rephrase or use alternative structures when possible.
私の友達のお母さんの車
My friend's mother's car
In relative clauses, の can sometimes replace が to mark the subject, especially in formal or written Japanese. This is a remnant of classical Japanese genitive usage.