他一定在家，对不对？
He isn't here. He must be at home.
他不在这里，他一定在家。
他现在肯定在家。
他一定在家。
The door iso pen now, he must be at home.
门现在开着，他一定在家。
He must be at home now, because he is ill.
他现在一定在家，因为他病了。
The light in his home, he must be at home.
他家的灯亮着，他一定在家。
The light is on, so he must be at home now.
灯开着，所以他现在一定在家。
If Billy isn't at school, he must be at home.
如果比利不在学校，他肯定在家。
I saw him enter the house. He must be at home.
我看见他进了这房子，他一定在屋里。
He must be finishing his homework at home.
(正在进行)他一定在家做作业。
He must be pretty mad at her for not being at home when they arrived.
他们到达时她不在家，他对此一定非常恼火。
Mr Wang must be at home, isn't he?
王先生必须在家，对吗？
If Fred left here at five o 'clock, he must be home by now.
如果弗雷德五点钟离开这里，现在想必已到家了。
If Fred left here at five o 'clock, he must be home by now.
如果弗雷德五点钟离开这里，现在想必已到家了。
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