почему́

adverb

Meanings Related words
relational (and) so; that's why
он забы́л а́дрес, почему́ (он) и не писа́л he forgot the address (and) so, or that's why, he did not write
interrogative why (due to what, on what grounds)
Почему́ вы говори́те э́то? Why do you say this?
Почему́ он жела́ет ви́деть меня́? Why does he wish to see me?
indicative why (due to what, on what grounds)
Я не зна́ю, почему́ телефо́н не рабо́тает. I don't know why the phone isn't working.
used in the following idiomatic expressions
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почему | Slovarish | Словарищ