you must be home at half past ten这里的be是什么作用啊at half past ten这个没学过,

来源：学生作业学帮网编辑：学帮网时间：2024/05/21 03:11:02

you must be home at half past ten
这里的be是什么作用啊
at half past ten
这个没学过,

must 情态动词后接动词原形,故要用be ‘ 在（家’
at half past ten 在10：30
翻译：10：30你必须在家.

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1. must在此句中是必须的意思，表示命令。be home在家，回家。be 表状态。也可用be at home或be back home.不能说must back home。因为must后接动词原形， back是介词。
2. must be+名/形/介词短语表示推测，是一定是的意思。例如：
You must be a teacher.你一定是个老师。
It must be true.这件事一定是真的。
She must be at school.她一定在学校。
3. must be+doing一定在做某事。例如：
He must be watching TV.他一定在看电视。
希望对你有用！

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