他绝不可能在家里,我刚才还看见他在教室里。
He cannot be at home. I saw him in the classroom a moment ago.
他应该在家;我看见他家亮灯了。
没必要这样做。他一定不在家,因为今天早晨我看见他登上了飞往北京的航班。
There's no need to do so. He can't be at home, because I saw him board the flight to Beijing this morning.
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