求解答英语。。
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1 They must be happy .
They mustn't be happy.
2 She must be a doctor .
She mustn't be a doctor.
3 LIsa must be ill .
LIsa mustn't be ill.
4 Yolanda must be sleepy .
Yolanda mustn't be sleepy .
They mustn't be happy.
2 She must be a doctor .
She mustn't be a doctor.
3 LIsa must be ill .
LIsa mustn't be ill.
4 Yolanda must be sleepy .
Yolanda mustn't be sleepy .
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