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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。 | 
