第1个回答 2013-10-31
如果“去”这个动作发生在过去,则用:Why did you go to BeiJing ?
如果发生在将来,则用:Why are you going to Beijing ?
第2个回答 2013-10-31
Why did you go to Beijing?(已经去过的)
Why are you going to Beijing?(正在去或者将要去)
第3个回答 2013-10-31
why did you go to beijing?
第4个回答 2013-10-31
Why do you go to Beijing