?、? 三者在意義上基本相同，都有“一……就……”，“剛……就……”，但它們各有其特點。

　　Ⅱ. as soon as 最為普通，位置靈活，可在主句前，也可在其后。且可用作多種時態(tài)。如：

　　① As soon as I went in , Kate let out a cry of surprise. 我一進去，凱特就驚訝地叫了一聲。

　?、?I’ll tell him as soon as he comes back.

　　Ⅲ. hardly… when…的主句通常 用過去完成時，從句用一般過去時，when有時還可換成before.如：

　?、?He had hardly finished his homework when the light went out. 他剛寫完作業(yè)燈就滅了。

　?、?Hardly had I come back when they began quarrelling.我一回來他們就開始吵了起來。(hardly 提前時，句子需要倒裝。)

　?、? no sooner…than…句型中， no sooner一般只置于句首，所以主句有倒裝形式。如：

　　No sooner had I known the news than I telephoned my mother. 我剛知道這個消息就打電話告訴了媽媽。