江西成人高考高起点英语语法归纳与练习十五
- 来源:
- 江西成考网
- 发布日期
- 2017年04月19日
摘要: lesson 15 情态动词(二) 内 容 提 要 情态动词有can(能),may(可以),must(必须),have to(不得不),ought to(应该),dare(敢),used to(过去经常),had better(最好),would rather(宁愿)。在肯定句中它们后边都要接 动词原形 .在否定句中,can,may,must和dare后边加not;have to和o
lesson 15 情态动词(二)
内 容 提 要
情态动词有can(能),may(可以),must(必须),have to(不得不),ought to(应该),dare(敢),used to(过去经常),had better(最好),would rather(宁愿)。在肯定句中它们后边都要接 动词原形 .在否定句中,can,may,must和dare后边加not;have to和ought to分别在have和ought后加not;used to的否定式可用used not to,也可用didn't use to,但后者用得较多;had better和would rather的否定式分别是had better not和would rather not.这些情态动词与现在完成时连用在某种意义上有一定的虚拟性。
情态动词与完成时的使用
一、must+have+ED分词:用于肯定句,表示对过去情况的一种肯定推测,表示“肯定,一定”
1) It around nine o'clock when I drove back home because it was already dark.
[A] had to be [B] must have been [C] was to be [D] must be
2) John's score on the test is the highest in the class;
[A] he should study last night
[B] he should have studied last night
[C] he must have studied last night
[D] he must had to study last night
3) After searching [A] for evidence in the house,the police concluded [B] that the thief must have come in [C] through the window and stole [D] the silver while the family was asleep.
二、may (might)+have+ED分词:用于肯定句和否定句,表示对已发生
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