Explanation
Asking the reason or cause; 'why', 'how come'.
Formation
なんで + [phrase or sentence]
Detailed explanation
The なんで grammar point is used to ask the reason or cause behind something. It can be translated as 'why' or 'how come' in English. It is a casual way of asking for an explanation, and it can be used with verbs, い-adjectives, な-adjectives, and nouns.
Examples
なんで遅れたの？
Nande okureta no?
Why were you late?
なんでこの部屋はこんなに汚いの？
Nande kono heya wa konna ni kitanai no?
Why is this room so dirty?
なんで彼女は怒っているの？
Nande kanojo wa okotte iru no?
Why is she angry?
なんで今日は休みなの？
Nande kyou wa yasumi na no?
Why is today a holiday?
Practice
Grammar content sourced from hanabira.org.