高一英语学习:三四单元重难点句型归纳二

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高一英语学习:三四单元重难点句型归纳二

3. Before she could move,she heard a loud noise. 她还没有来得及动弹,就听见很响的声音。

However, before she could think twice, the water was upon her. 但还没有回过身来,洪水便逼近了她。

该两句中的before用作连词,后接时间状语从句。before用作连词,接时间状语从句时,表示“在……之前”。但在不同的语境中,往往有比较灵活的译法。例如: He knocked me down before he saw me. 他差一点把我撞倒,才看到我。

【考例】(2005广东) The American Civil War lasted four years the North won in the end.

A. after B. before C. when D. then

[考查目标] 时间状语从句的引导词选择。

[答案与解析]B before 表示“直到……”。

4. Tree after tree went down, cut down by the water, which must have been three meters deep. 洪水想必深达三米,树一棵接一棵地倒了,被洪水冲断了。

该句中的must have been表示推测。例如:You look so tired. You must have stayed up last night.

情态动词may,might,most.can,could常用来表示推测。may,might,must多用在肯定句中,can,could多用在否定句和疑问句中。may,might,must,can,could后接动词原形表示对现在的推测;may,might,must,can,could后接have done。表示对过去的推测。例如:

You may be a professor. / She must have met a fairy.

【考例】(2005辽宁)This cake is very sweet. You ____ a lot of sugar in it.

A. should put B. could have put

C. might put D. must have put

[考查目标] 情态动词表示推测。

[答案与解析] D 前文说蛋糕很甜,由此可知一定是糖

放多了。对于过去的动作的推测应使用have done的

结构,所以应在B、D之间做选择,又因为could have

done表示本可以做而没有做,所以选择D。

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