状语从句有很多，其中时间状语从句、条件状语从句是最主要的。它的时态由主从句相呼应来决定，条件状语从句表达将来的情况，但主句为一般将来时，从句为一般现在时态；时间状语从句则“主将从现，主过从过”，过包括一般过去时和过去进行时两种情况。结果状语从句也很重要，其次是原因、目的、让步、方式和比较状语从句，这些从句的时态主从句一致即可。这些从句已经在“连词”中复习到了。

　热身训练

　　1.The children were leaving school on Tuesday _______ they saw an accident。

　　A.when     B.while

　　C.because D.after

　　2.We won't go to the park __ it is fine tomorrow。

　　A.if     B.when

　　C.because D.unless

　　3.We'll see Uncle Wang this Sunday if it ___。

　　A.won't rain B.isn't rain

　　C.doesn't rain

　　D.didn't rain

　　4.——What was the party like?

　　——Wonderful.It's years ___ I enjoyed myself so much。

　　A. after    B.when

　　C. before D. since

　　5.None of them knew it ______ the teacher told them。

　　A. when B. until

　　C. after    D. though

　　6.——I hope you'll enjoy your holiday, Tom。

　　——Thank you, grandma. I'll call you ______ I arrive there。

　　A.as soon as B.when

　　C.before D.until

　　7.She ______ Chinese since she came to China。

　　A.studied B.was studying

　　C.has studied

　　D.is studying

　　8.Someone knocked at the door ______ I was answering the telephone。

　　A.while B.because

　　C.but D.as soon as

　　9.You should make a plan ____ you do everything important。

　　A.when B.before

　　C.after D.if

　　10.——I don't know _____ he will come tomorrow。

　　——Don't worry. _______ he comes, I'll let you know。

　　A.when；If

　　B.if；Whether

　　C.if；If

　　D.whether，Whether

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