灵鹊做题网ought to与推测时与must的区别
来源：学生作业帮 编辑：灵鹊做题网作业帮 分类：英语作业 时间：2024/04/26 22:55:01
ought to与推测时与must的区别
must表示推测
1) must用在肯定句中表示较有把握的推测,意为"一定".
2) must表对现在的状态或现在正发生的事情的推测时,must 后面通常接系动词be 的原形或行为动词的进行式.
You have worked hard all day.You must be tired.你辛苦干一整天,一定累了.（对现在情况的推测判断）
He must be working in his office.他一定在办公室工作呢.
比较：
He must be staying there.
他现在肯定呆在那里.
He must stay there.
他必须呆在那.
3) must 表示对已发生的事情的推测时,must 要接完成式.
I didn't hear the phone.I must have been asleep.我刚才没有听到电话,我想必是睡着了.
4) must表示对过去某时正发生的事情的推测,must 后面要接不定式的完成进行式.
---Why didn't you answer my phone call?
---Well,I must have been sleeping,so I didn't hear it.
ought to语气更强烈
再问： He must be home by now. 与 He ought to be home by now.有什么区别？
再答： 第一句说他一定到家，而第二句说他应该到家，第一句更肯定
1) must用在肯定句中表示较有把握的推测,意为"一定".
2) must表对现在的状态或现在正发生的事情的推测时,must 后面通常接系动词be 的原形或行为动词的进行式.
You have worked hard all day.You must be tired.你辛苦干一整天,一定累了.（对现在情况的推测判断）
He must be working in his office.他一定在办公室工作呢.
比较：
He must be staying there.
他现在肯定呆在那里.
He must stay there.
他必须呆在那.
3) must 表示对已发生的事情的推测时,must 要接完成式.
I didn't hear the phone.I must have been asleep.我刚才没有听到电话,我想必是睡着了.
4) must表示对过去某时正发生的事情的推测,must 后面要接不定式的完成进行式.
---Why didn't you answer my phone call?
---Well,I must have been sleeping,so I didn't hear it.
ought to语气更强烈
再问： He must be home by now. 与 He ought to be home by now.有什么区别？
再答： 第一句说他一定到家，而第二句说他应该到家，第一句更肯定
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