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2021年中考英语知识点之状语从句的引导词

2021-03-22 19:49:41中考网编辑
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  中考网整理了关于2021年中考英语知识点之状语从句的引导词,希望对同学们有所帮助,仅供参考。

  不同类型的状语从句用不同的引导词

  1.时间状语从句

  ① 时间状语从句常用when, as, while, before, after,since, till, until, as soon as等连词来引导。如:

  While he was doing his homework, the telephone rang.

  As he walked along the lake, he sang happily.

  He had learned a little Chinese before he came to China.

  After he finished middle school, he went to work in a factory.

  ② 在时间状语从句里,用一般现在时代替一般将来时,用一般过去时代夫过去将来时。如:

  I’ll ring you up as soon as I get to New York.

  I would tell him everything when he came back.

  2. 条件状语从句

  ① 条件状语从句通常由if(如果), unless(除非)引导。如:

  What shall we do if it snows tomorrow?

  Don’t leave the building unless I tell you to.

  ② 在条件状语从句里,用一般现在时代替一般将来时,如:

  I’ll help you with your English if I am free tomorrow.

  He won’t be late unless he is ill.

  ③ “祈使句 + and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。如:

  Hurry up, and you’ll catch the early bus.

  = If you hurry up, you’ll catch the early bus.

  Hurry up, or you’ll be late.

  = If you don’t hurry up, you’ll be late.

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