I demand that he must work hard.
我要求他一定要用功念书。
我要求他一定要用功念书。
I know I 'am lazy, so he must work hard.
我知道我很懒，所以他必须勤快一点。
He must work hard at physics, mustn't he?
他必须努力学习物理，是吗？
He must work very hard in order to support his large family .
他必须拼命工作以养活他的大家庭。
If a man is to succeed, he must work as hard as he can.
如果一个人要成功，他一定尽他所能地努力工作。
他说他们必须努力工作。
He must work very hard in order to support his large family.
他必须拼命工作以养活他的大家庭。
He said that they must work hard.
他说他们必需高兴工作。
He said that they must work hard.
他说他们必需高兴工作。
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