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情态动词(Modal Verbs)是英语语法中的一个重要概念,它们通常用来表达说话人对某件事情的态度、情感或意愿。情态动词包括 can, could, may, might, will, would, shall, should, must 等。在英语中,如果我们想要将情态动词变成否定句,需要注意以下几点:
1. 用not将情态动词变成否定形式
在英语中,我们可以使用not将情态动词变成否定形式。例如,can变成cannot或can't,may变成may not或mayn't,will变成will not或won't等。
例如,我们可以将以下肯定句变成否定句:
- She can speak English. (她会说英语。)→ She cannot speak English. / She can't speak English. (她不会说英语。)
- He may come to the party. (他可能会来参加聚会。)→ He may not come to the party. / He mayn't come to the party. (他可能不会来参加聚会。)
- I will finish my homework tonight. (我今晚会完成我的作业。)→ I will not finish my homework tonight. / I won't finish my homework tonight. (我今晚不会完成我的作业。)
2. 在情态动词之后加上not
在英语中,我们也可以在情态动词之后加上not来表达否定意义。例如,we cannot, we can not, we can't三种表达方式都正确。但是需要注意的是,should和had better后面的not应该与should连写成shouldn't和had better连写成hadn't better。
例如,我们可以将以下肯定句变成否定句:
- You should study harder. (你应该更加努力学习。)→ You shouldn't study harder. (你不应该更加努力学习。)
- He had better leave now. (他最好现在离开。)→ He hadn't better leave now. (他最好现在不要离开。)
3. 情态动词的缩略形式
在英语中,情态动词有一些常用的缩略形式,例如can't, won't, shouldn't, hadn't等。需要注意的是,在使用情态动词的缩略形式时,我们应该遵循英语的语法规则。
例如,我们可以将以下肯定句变成否定句:
- She would like to go to the cinema. (她想去电影院。)→ She wouldn't like to go to the cinema. (她不想去电影院。)
- You could ask him for help. (你可以向他求助。)→ You couldn't ask him for help. (你不能向他求助。)
总之,在使用情态动词时,我们需要灵活运用not和其他语法规则,以便准确地表达自己的意思。