解析 没有must not have done,表示对过去事情肯定的推测用must have done,否定的推测只能用can't/couldn't have done. 结果一 题目 must have done 否定是什么?没有must not have done?用什么? 答案 没有must not have done,表示对过去事情肯定的推测用must have done,否定的推测只能用can't/couldn't hav...
同学你好哦~must have done 必定做了…(表示对过去的推测)must表示推测时的否定式是can’t或couldn’t(不可能) .过去式用couldn'tIt couldn't happen.不可能发生。以上,祝同学学习愉快~ 版权申明:知识和讨论来自课程:《中小学金牌新概念英语第三册【升级班】》的学员和老师,如果想了解更多,可以报名参加课程学习...
在否定句中,'must have done'的否定形式为'can't/couldn't have done',表示对过去事情的否定推测。如,“He can't have gone to the movies; he was with me all night.”(他不可能去看电影了,他整晚都和我在一起。) 在疑问句中,'must have done'通常不使用must来提...
1. must have done 表示对已经发生的事情的推测,意为“一定,想必”.这种结构一般只用于肯定句,其否定形式是can't (couldn't)have done ,表示“不可能,肯定不会”.例如: He didn't hear the phone. He must have been asleep.2. can(could)have done表示对过去的时间内可能发生的事情的猜测,can have ...
must have done的否定疑问句 英语中must have done的否定疑问句的用法和构成 一、must have done的含义和用法 must have done是一种情态动词+完成式的结构,表示对过去发生的事情的肯定推测或判断,意为“一定做了某事”。例如:He must have left, because his car is not here. 他一定走了,因为他的车不在...
答案 must have done 的否定形式是couldn't have done 这两个词组表示对过去的一种猜测 mustn't have done这个词组.是不存在的~``千万不要以为他就是must have done 的否定形式. 相关推荐 1 mustn't have done和 couldn't have done有什么区别还有must have done 的否定形式是什么 反馈...
must have done的否定形式是can't have done.用must来表示肯定、猜测;用can't 来表示动作不可能发生,如:- that must be wrong.- No, it can't be wrong.过去式举例:He walked past me without speaking. He can't have seen me.couldn't have...可以替代can't have......
can not be done
考点八 “情态动词十have done”的用法情态动词十have done含义一定做过(其否定形式为must have done can't/couldn't have
否定式为don't have to,意为“不必”,相当于need't。 You need't have to do this. 你不必这么做。(没有必要这么做了) *Must补充* -must表示推测 只用于肯定句(must do),表示对现在情况的推测 must be doing 表示对正在发生的情况的推测 must have done 表示对过去情况的推测 ...