一般which用在句中,那样的话它一般有一个前提,那就是之前已经提到过句中想要说明的东西的大概范围.
如 I like all kinds of sports,which can help me keep my body healthy.
这里which就是指代前面出现了的sports.
或 I recognize Kim,which has helped me.
这里的which也是指前面出现的Kim.
用在句首的话一般是疑问句：Which is the boy had broken my window last week?
或者 Which of these songs make you feel in paradise?
