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高考网汇集整理《高一英语知识点总结及重难点解析：Unit3-4句型归纳(2)》 句型归纳(2) 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。 (责任编辑：admin) |