i don't know where they have gone

i don't know where they have gone 我不知道他们去了哪里?I don＂t know where they have gone.为什 Where is Peter I don't know where he has ____ gone还是been ,请详 急I don't know where they live.改成一般过去时? I don't know where Mr yang has gone.You'd better ask( ) I don’t know _______ they have passed the exam. You don't know good things till they are gone. I don't know where is it I really don't know where to I don't know where to begin. I don't know where you are don't where he I know is