The teacher treats the student as if he were her own child.这位老师带这位学生就象她的亲生孩子一样。 He speaks as if he had been to the United States.他说得好象他真的到过美国似的。 (2)在It is time (that)从句中,谓动词常用动词过去式或should+动词原形 表示虚拟语气
(3)I’d rather (that)…句型中从句中虚拟语气,
Eg.
I would rather you did it now.
I would rather you did it tomorrow.
I would rather you had done it yesterday.
5. 用在if only 引起的感叹句中 (用法与wish相同)
If only the driver didn’t drive so fast!
6.在由 for fear that, in case, lest 等引导的状语从句中,用should+动词原形
考点九:情态动词
1.情态动词的基本用法
(1)can、be able to 和could ①can和be able to都表示能力,意思上没多大区别。但can只有现在和过去时,而be able to则有更多的形式。但当成功地完成某一具体动作时,通常不用could而用was/were able to来表示。这时was/were able to 相当于managed to,表示经过一番努力,终于能够完成某事。如: Can you use chopsticks? The wounded man still was able to get to the village and was saved in the end. ②can和could can和could都可以表示能力、技能、许可、建议或请求和可能性。但比较委婉客气地提出问题或陈述看法,一般用could,回答时则用can。如: Could you help me carry the bag? Can I help you? (2)may/might ①may/might表示可能,但may比might可能性大。
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