作业帮英语专家进!i don't think he could have done so much homework,last night.i don't think he could have done so much homework,last night._______(反义疑问句)为什么 不加 last night 就可以填 could he,加上 last night 就必须填 did he
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英语专家进!i don't think he could have done so much homework,last night.i don't think he could have done so much homework,last night._______(反义疑问句)为什么 不加 last night 就可以填 could he,加上 last night 就必须填 did he
英语专家进!i don't think he could have done so much homework,last night.
i don't think he could have done so much homework,last night._______(反义疑问句)
为什么 不加 last night 就可以填 could he,加上 last night 就必须填 did he 了 ,
英语专家进!i don't think he could have done so much homework,last night.i don't think he could have done so much homework,last night._______(反义疑问句)为什么 不加 last night 就可以填 could he,加上 last night 就必须填 did he
需要注意的是,加上last night ,事情发生的时间就已经确定,昨晚,所以应该用did he.不加last night,由于该句子是个宾语从句,当主句的谓语动词是think,believe,suppose,guess,expect,imagine,并且主句主语为第一人称时,疑问部分的主语和谓语动词要与宾语从句的主语和动词保持一致；若他们的主语为第二三人称时,后面的反问部分有主句来决定.例如：1.I do not think he will succeed,will he?2.TOM does not believe Jack will succeed,does he?
慢慢体会吧,也不知道说的明不明白.
加上last night 表明句子中的could 是can的过去式。所以必须用did he
如果不加last night 这个could 有可能是情态动词 表示应该 也有可能是can的过去式 此时的答案是两个 could he & did he
因为could have done是一个固定用法“本可以做”。加上last night 就是一个完整的表述事实的句子“我不相信他昨晚上做了那么多作业，不是吗？”因此对这个事实疑问，是不是用助动词did，然而不加上last night就是“我不认为他可以做那么多作业”对他的能力提问所以用could he...
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因为could have done是一个固定用法“本可以做”。加上last night 就是一个完整的表述事实的句子“我不相信他昨晚上做了那么多作业，不是吗？”因此对这个事实疑问，是不是用助动词did，然而不加上last night就是“我不认为他可以做那么多作业”对他的能力提问所以用could he
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同意sebastos的idea