原因状语从句的时态跟主句有关系,但不能被主句决定,还是要看前后关联。给你一些例子吧。I'll be back bcz she will be back.I'm back bcz she will be back.上两句,主句时态不一,但从句都是将来时。但是主句通常可以主宰整个句子的时态。比如:I would be back bcz she would be back.I was back bcz she would be back.因为主句用的过去时,所以从句要相应用过去时——但两句的从句的时态,并没有因为主句的时态而变。所以,主从句的时态不一定一样。...