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.
because (polite, objective)
Attach to plain form; な-adj/noun + な.
because of (noun, negative)
because of (noun, positive)
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...'.
I'm tired, so I'll go to bed early.
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.
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.
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.
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...'.
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.
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.
Because it's dangerous, please don't touch it. (direct warning)
Because it's raining, the game is canceled.
Because of the typhoon, the trains stopped.
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.
Many buildings collapsed because of the earthquake.
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.
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.
The road is closed because of construction.
Why were you late? ― Because the train was delayed.
The written or formal version of んです. Used in essays, articles, or formal speech to provide an explanation.
He succeeded because he worked hard.
A: Why aren't you eating? B: Because I'm full.
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.
I'm sorry, because something urgent came up.
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.