Ⅰ. 三者在意义上基本相同,都有“一……就……”,“刚……就……”,但它们各有其特点。
Ⅱ. as soon as 最为普通,位置灵活,可在主句前,也可在其后。且可用作多种时态。如:
① As soon as I went in , Kate let out a cry of surprise. 我一进去,凯特就惊讶地叫了一声。
② I’ll tell him as soon as he comes back.
Ⅲ. hardly… when…的主句通常 用过去完成时,从句用一般过去时,when有时还可换成before.如:
① He had hardly finished his homework when the light went out. 他刚写完作业灯就灭了。
② Hardly had I come back when they began quarrelling.我一回来他们就开始吵了起来。(hardly 提前时,句子需要倒装。)
Ⅳ. no sooner…than…句型中, no sooner一般只置于句首,所以主句有倒装形式。如:
No sooner had I known the news than I telephoned my mother. 我刚知道这个消息就打电话告诉了妈妈。