Change the following sentences in the same way. must/mustn't
1.I think you are made to do that.
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2. I think you are mistaken
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3. I suppose they are a rich familiy nowadays.
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4.John is working late at the office, I suppose.
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5. I suppose the biggest city in the world is xangai
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6. Surely he's very busy if he can't come to the party
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7.Surely those children over there are playing football.
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8.Surely it is a policeman I can see over there