Translation guide
The English word 'because' introduces a reason or cause. In Japanese, expressing reason depends on the level of formality, the type of clause, and whether the reason is subjective or objective. The most common patterns are から and ので, but other forms exist for written, formal, or explanatory contexts.
Express a personal reason, excuse, or subjective cause. Common in everyday speech.
Attach to the plain form of a verb, adjective, or noun + だ. It emphasizes a subjective reason and is often used when giving personal excuses or opinions. Can be used at the end of a sentence to imply 'because...'.
疲れたから、早く寝ます。
I'm tired, so I'll go to bed early.
明日は休みだから、遅くまで起きていられる。
Because tomorrow is a day off, I can stay up late.
Attach to the plain form (but な-adjectives and nouns use な). It sounds softer and more objective than から, often used to give a reason politely or to explain a situation.
雨が降っているので、試合は中止です。
Because it's raining, the game is canceled.
Express a logical or objective reason, often in formal speech or writing.
Attach to the plain form of a verb/adjective or noun + の. It indicates a cause-and-effect relationship and is common in formal writing, news, and announcements. The に is often omitted when expressing cause.
台風のため、電車が止まりました。
Because of the typhoon, the trains stopped.
Express 'because of [noun]' in various registers.
Attach to a noun. It implies that the noun is the cause of a negative outcome, often with a nuance of blame. Casual to neutral.
雨のせいでピクニックが中止になった。
The picnic was canceled because of the rain.
Attach to a noun. It means 'thanks to' and indicates a positive cause. Can be used sarcastically for negative outcomes.
Provide a reason or explanation in response to a question or to clarify a statement. Often used with んです/のだ.
Attach to the plain form (な-adjectives/nouns use な). This is the contracted form of のです and is used in spoken Japanese to give an explanation or reason. It often implies 'the thing is...' or 'it's because...'.
どうして遅れたんですか？ ― 電車が遅れたんです。
Why were you late? ― Because the train was delayed.
End a sentence with 'because' to imply an unstated reason or to answer a question informally.
Simply end the sentence with から after the plain form. Very common in casual conversation to give a reason or excuse.
A: なんで食べないの？ B: お腹がいっぱいだから。
A: Why aren't you eating? B: Because I'm full.
から is more subjective and direct, often used for personal reasons, excuses, or commands. ので is softer, more objective, and polite, suitable for explaining situations or making requests. In formal writing, ので is preferred over から.
危ないから、触らないでください。
Because it's dangerous, please don't touch it. (direct warning)
危ないので、触らないでください。
Because it's dangerous, please don't touch it. (polite explanation)
English 'because' is a conjunction, but Japanese uses particles or patterns attached to clauses. Do not try to translate 'because' as a standalone word; instead, learn the appropriate pattern for the context.
I was late because there was an accident.
Attach to a noun. It means 'due to' or 'because of' and is used in formal or written contexts to indicate a cause, often an external factor.
地震によって多くの建物が倒壊した。
Many buildings collapsed because of the earthquake.
あなたのおかげで成功しました。
I succeeded because of you (thanks to you).
Attach to a noun. Neutral and formal, meaning 'due to' or 'because of'. Often used in official statements.
工事のため、通行止めです。
The road is closed because of construction.
The written or formal version of んです. Used in essays, articles, or formal speech to provide an explanation.
彼が成功したのは努力したからなのだ。
He succeeded because he worked hard.
A softer, more polite way to end a sentence with 'because'. It sounds humble and is often used in formal situations to apologize or explain.
申し訳ありません、急用ができたもので。
I'm sorry, because something urgent came up.