2017届高考英语一轮复习教案：3.2《Healthy eating》（人教版必修3）_高考复习指南

　　(1)在肯定句中表示对过去情况的推测时，不用此结构，而是用must have done。如：

　　Something terrible must have happened if Li Chang was not coming to eat in his restaurant as he always did.

　　要是李昌不像往常那样到他餐馆里吃饭，那问题一定很严重了。

　　It is wet outside on the ground.It must have rained last night.

　　外面地上很湿，昨天晚上肯定下雨了。

　　(2)could have done还有“本来能够做”的意思，表示实际并没有去做这件事，只是一种假设或者虚拟的语气。如：

　　He paid for a seat when he could have entered for free.

　　他本来可以免费进场，但是他还是买了票。即境活用单项填空

　　①It________have been more than six years old when the accident happened.

　　A．shouldn't

　　B．couldn't

　　C．mustn't

　　D．needn't

　　②Mary was not in her bedroom yesterday afternoon.She________in her classroom.

　　A．should have been

　　B．must have been

　　C．must be

　　D．should be

　　答案：①B　②B　

　　2．Why don't you sit down and try a meal?

　　你为什么不坐下来吃顿饭呢？

　　●用法拓展

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