表示否定推测只能用can't 和 couldn't
来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/22 23:25:43
表示否定推测只能用can't 和 couldn't
1.对现在情况的推测:must/can't be; must/can't be doing
He must be in the library.He can't be in the classroom.
(他一定是在图书馆.他不可能在教室里.)
She must be doing her homework.She can't be watching TV.
(她肯定是在做作业.她不可能在看电视.)
2.对过去情况或已经发生的情况的推测:must/can't have done
He must have left for Beijing.(他肯定已经前往北京了.)
(她不可能这么早就完成了工作.)
He must be in the library.He can't be in the classroom.
(他一定是在图书馆.他不可能在教室里.)
She must be doing her homework.She can't be watching TV.
(她肯定是在做作业.她不可能在看电视.)
2.对过去情况或已经发生的情况的推测:must/can't have done
He must have left for Beijing.(他肯定已经前往北京了.)
(她不可能这么早就完成了工作.)
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