①You’d better tell him about the matter, hadn’t you?②We had better do it by ourselves, hadn’t we?
18.陈述部分用used to +主语时,问句部分用didn’t + 主语?或usedn’t +主语?形式。
①He used to live in the country, didn’t he?/usedn’t he?
②They used to be good friends, didn’t they?/usedn’t they?
19.陈述部分用must(may, might) + have + V-ed表示推测时,若句中带有明显的过去时间的状语,问句部分动词用过去时形式。如:
①He might have forgotten his pen in the classroom yesterday, didn’t he? (不用mightn’t he?/ hasn’t he?)
②You must have got up late this morning, didn’t you?(不用mustn’t you?/haven’t you?)
20.陈述部分用must(may, might) + have + V-ed表示推测时,若句中没有带明显的过去时间的状语,问句部分动词用现在完成时形式。如:
①Everyone must have known the death of the waitress, haven’t they? (不用mustn’t they?)
②You must have worked there a year ago, didn’t you?(不用mustn’t you?/ haven’t you?)
21.陈述部分的主语为从句时,问句部分的主语一般用it代替,如:
①What he said is true, isn't it? (不用didn’t he?)
②Where we will build the dam has not been decided yet, has it? (不用won’t we?)
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