when while as 的用法

1．从句动作在主句动作前发生，只用 when。 中国英语博客基地(English Blogs-英语麦当劳博客空间)m~e~9m\i
①When he had finished his homework，he took a short rest．（finished先发生）当他完成作业后，他休息了一会儿。 中国英语博客基地(English Blogs-英语麦当劳博客空间)+g:QY1Y5U c6S/E
②When I got to the airport，the guests had left．（got to后发生）当我赶到飞机场时，客人们已经离开了。
`6WNy+hGu7o02．从句动作和主句动作同时发生，且从句动作为延续性动词时，when，while，as都可使用。
2Q.{Y(k;m0①When ／While ／As we were dancing，a stranger came in．（dance为延续性动词）当我们跳舞时，一位陌生人走了进来。
9o*h p!Bj'm)Oo0②When ／While ／As she was making a phonecall，I was writing a letter．（make为延续性动词）当她在打电话时，我正在写信。中国英语博客基地(English Blogs-英语麦当劳博客空间)9s#pF*?L
3．在将来时从句中，常用when，且从句须用一般时代替将来时。
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g0①You shall borrow the book when I have finished reading it．在我读完这本书后，你可以借阅。 中国英语博客基地(English Blogs-英语麦当劳博客空间)S
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②When the manager comes here for a visit next week，Ill talk with him about this．下周，经理来这参观时，我会和他谈谈此事。 中国英语博客基地(English Blogs-英语麦当劳博客空间)+{5}-CnU,d)Zh
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、when用于表示“一……就……”的句型中（指过去的事情）。 中国英语博客基地(English Blogs-英语麦当劳博客空间)I3Ullq3VC
sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．．
SylY#s1t0①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door．我刚一闭上眼，就有人在敲门了。
%T2O0hU0x0②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．我刚一走进房门，电话就响了。
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