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?)
二十三、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?)
二十四、陈述部分的主语为动名词或不定式时,问句的主语用it代替。如:
①To do one good deed is easy for a person, isn't it?
②Skating is your favorite sport, isn't it?
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