Grammar
Ⅰ.改错
1．—What do you suppose has happened to him?
—I don't know. He should have got lost.
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2．—Jerry doesn't mind lending you his bike.
—He couldn't. I have borrowed Mary's.
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3．If he had been here, he can have given us some help.
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4．I didn't hear the phone. I should have been asleep.
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5．My EnglishChinese dictionary has disappeared. Who would have taken it?
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6．Great changes must have taken place in the village in the past few years, mustn't they?
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7．He mustn't have watched TV yesterday for I saw himin the lab.
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8．Jane didn't come to' school yesterday, so she needn't have been ill.
