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,

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youmustbehomeathalfpastten这里的be是什么作用啊athalfpastten这个没学过,youmustbehomeathalfpastten这里的be是什么作用啊athalfp

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,
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,

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。
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