He must have been asleep at that time,(wasn't) he?为什么是用 wasn't 而不是 didn't
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He must have been asleep at that time,(wasn't) he?为什么是用 wasn't 而不是 didn't
情态动词表示推测的句子,完成反义疑问句时,首先要去除推测,还原成普通句子.故
He must have been asleep at that time根据at that time 为过去时间,需还原成:
He was asleep at that time.中间为be动词的肯定式,故为:wasn't he.
解析:“have十过去分词”表示对过去行为的推测,其反意疑问句有两种形式,即一般过去时或完成时,受题中he, 故此题答案是must对过去的动作推测时,反意疑问句部分的助动词用have, 而对过去的状态推测,反意疑问句部分的was:
She must have finished her work, hasn’t she ? / didn’t she ?
Jack must have...
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解析:“have十过去分词”表示对过去行为的推测,其反意疑问句有两种形式,即一般过去时或完成时,受题中he, 故此题答案是must对过去的动作推测时,反意疑问句部分的助动词用have, 而对过去的状态推测,反意疑问句部分的was:
She must have finished her work, hasn’t she ? / didn’t she ?
Jack must have arrived here yesterday, didn’t he ?
He must have been a policeman, wasn’t he ?
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因为been, be的否定是is, 过去分词所以was