Translation guide
The English question word "why?" is used to ask for a reason or cause. In Japanese, the most common equivalent is なぜ (naze) or どうして (doushite), but the choice depends on formality and context. This guide covers direct question words, casual alternatives, and natural strategies for asking reasons in conversation.
To ask why something happened or why someone did something, in a neutral or formal context.
To ask 'why?' in informal conversation with friends or family.
Very common casual 'why'. Used in everyday speech. Can sound blunt or childish in formal settings.
To express frustration, disbelief, or to ask a rhetorical question.
Often used in emotional outbursts. The intonation conveys the feeling.
To politely inquire about the reason, often in customer service or formal situations.
Simple polite 'why is that?'. Safe for most polite contexts.
Why is that?
To ask 'why' by linking a reason-seeking question to a previous statement, common in casual speech.
Used after a statement to ask 'why?' casually. The て form connects the context.
なぜ is formal/written, どうして is spoken/emotional, なんで is casual. なんで can also mean 'by what means' in some dialects, but context usually clarifies.
Why were you late? (formal)
Why did you quit your job?
どうして泣いているの？
Why are you crying?
なんで来なかったの？
Why didn't you come?
Even in casual speech, なぜ can be used, but it sounds more serious or literary.
Why did you do that?
Why did this happen...?
Very casual, masculine-leaning expression of frustration. 'Why the hell...?'
Why?! (What the hell!)
More indirect and softer than なぜですか. Suitable for delicate questions.
Why might that be?
I heard you took a day off yesterday, why?
Why were you late? (spoken, curious)
Why were you late? (casual)
In Japanese, directly asking 'why?' can sometimes sound accusatory or too direct. Softening with どうして or adding のか/のですか helps. In very polite situations, consider rephrasing to 'what is the reason?' (理由は何ですか).
Why is the sky blue?
Why not?