he must后面加动词原形。
例句：
On hills, he must use low gears.
在山上，他必须用低速挡。
He must have put on several kilos.
他体重一定增加了好几公斤。
He must learn to control his temper.
他得学会捺住性子。
I think he must be cracked, don't you?
我认为他一定是疯了，你说是不是？
He must have been a stranger to the town.
他当时一定是刚到这个镇子。
He was reeling a little. He must be very drunk.
他有点踉跄。他一定醉得很厉害。
He must like her, or he wouldn't keep calling her.
他一定喜欢她，不然他不会老给她打电话。
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