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看两个例子,帮我总结一下must be的用法!

来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:英语作业 时间:2024/06/14 19:54:56
看两个例子,帮我总结一下must be的用法!
1.He must be home before six o'clock.
He has to be home before six o'clock.
2.He must be tired.
I think he is probably tired.
这是课后练习中的题目要求,要求模仿例句改写以下句子:
He must be here at six o'clock.
He has to be here at six o'clock.
He must be busy.
I think he is probably busy.
句中的must be应该是“一定”的意思吧,为什么有的改写成have to ,有的改写成probably?
看两个例子,帮我总结一下must be的用法!
must后面接实意动词表达非常肯定、或命令:He must do it.他必须(命令)肯定会(把握很大)做.
后面接表示状态的词(be happy/be 18/be at home)接进行时(must be doing)以及完成时(must have done)则表达说话人对这件事的推测.
have to 是被逼无奈.
翻译后比较:他六点前肯定在家、不得不在家