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かどうか
kadouka
JLPT N3
Edit  Cacawate
Meaning
whether, if
It doesn't matter whether it's finished (lit. or not)
Edit  Cacawate
Formation
See also
Phrases
しりあいであるかどうかはかんけいない
It doesn't matter if ( or whether ) we know each other (lit. "or not")
Edit  #1118 dc
あなたはルーシーがにほんごをはなすことができるかどうかしっていますか。
Do you know if Lucy can speak Japanese?
Edit  #3634 dbx, Miki
あのひとにかのじょがいるかどうかしってる?
Do you know if he has a girlfriend?
Edit  #3635 dbx, Miki
きのうかれはあなたがおげんきかどうかたずねていました。
He asked after you your health yesterday.
Edit  #3636 dbx
このくつをためしにはいて、あうかどうかみてみなさい。
Try these shoes on and see of they fit you.
Edit  #3637 dbx
このバスがくうこうへいくかどうかわたしにはわかりません。
I can not tell whether this bus goes to the airport.
Edit  #3638 dbx
このワインがおくちにあうかどうかためしにのんでみてください。
Taste this wine to see if you like it.
Edit  #3639 dbx
このきかいがうまくうごくかどうかはうたがわしい。
It is doubtful whether this machine works well or not.
Edit  #3640 dbx
このくつをためしにはいて、あうかどうかみてください。
Try these shoes on and see if they fit you.
Edit  #3641 dbx
このけいかくがうまくいくかどうかはまだわからない。
It is yet to be seen whether this plan will succeed or not.
Edit  #3642 dbx
かれはにほんじんかどうかしりませんか。
o you know weather or not he's Japanese?
Edit  #8638 Sakuratree
Discussion and comments
According to notes I have from a class I took, if a question word (e.g., nani,itsu) is present you use only か, otherwise use かどうか.

Also, a plain form precedes か and if it is a noun or A2 adjective だ is omitted.
yookoso
どうか is derived from どう, meaning that an action or event is yet determined. E.g., 君はどうする = What are you going to do? どうしようもない = There is nothing one can do. [bamboo4]
dc