when while as 的用法

1．从句动作在主句动作前发生，只用 when。
%i,kN,@~Kv0①When 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。
`/th!u-TZR.g0②When 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。
%g~ll5t02．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。
8K4S)S8Cj0①When ／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。 中国英语博客基地(English Blogs-英语麦当劳博客空间),{LTuqU
②When ／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。
l)AD$?+CePK*d+V;C03．在将来时从句中，常用when，且从句须用一般时代替将来时。 中国英语博客基地(English Blogs-英语麦当劳博客空间)8H}(p#l v7A
①You shall borrow the book when I have finished reading it．在我读完这本书后，你可以借阅。
#a7x[t^#es0②When 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。
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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)E!\ W1y t%IV
sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．． 中国英语博客基地(English Blogs-英语麦当劳博客空间)JL#D4{(u-} D(j
①I 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。
fIw~ I tD%],]{,b0②I 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。中国英语博客基地(English Blogs-英语麦当劳博客空间)PlT O)XwGy k