Three questions.
Three questions.
1、Henry must have stayed up last night,____ he looks so tired and sleepy.
A.for B.as C.though D.since
2、You must always look carefully ______ you cross the road.
答案是before,我理解.可是不知道为什么觉得when也对.如何克服不去用when呢?
3、They were doing their homework when the telephone rang.
可以写成：They did their homework when the telephone was ringing.总是会弄不清楚到底是应该在从句还是主句里用过去进行时.
1、Henry must have stayed up last night,____ he looks so tired and sleepy.
A.for B.as C.though D.since
2、You must always look carefully ______ you cross the road.
答案是before,我理解.可是不知道为什么觉得when也对.如何克服不去用when呢?
3、They were doing their homework when the telephone rang.
可以写成：They did their homework when the telephone was ringing.总是会弄不清楚到底是应该在从句还是主句里用过去进行时.
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