－Tommusthavebeen
英语中，对已经发生过的事情进行主观猜测，常用must have done和can't have done。对现在的情况进行主观猜测，用must be和can't be。例如：
1、对现在情况的猜测：
He must be in the library。
(=I, personally, think that he is in the library。)
He can't be in the library。
(=I, personally, don't think he is in the library。 )
2、对过去情况的猜测：
He must have finished hi...全部
英语中，对已经发生过的事情进行主观猜测，常用must have done和can't have done。对现在的情况进行主观猜测，用must be和can't be。例如：
1、对现在情况的猜测：
He must be in the library。
(=I, personally, think that he is in the library。)
He can't be in the library。
(=I, personally, don't think he is in the library。
)
2、对过去情况的猜测：
He must have finished his homework, for he is playing in the garden。
He must have drunk a lot。
你提出的问题可以这样来看：他在课堂上受到责骂是发生在过去某一段时间，本应该用一般过去时。你的句子可以还原成：I think Tom was scolded in class, wasn't he?
另外，当主语是I或we与think，belive，suppose等动词连用时，反问要根据后面的宾语从句。
例如：
I don't think you've heard of him before, have you?
I don't think I will trouble you much, will I?
I think you understand it now, don't you?
。
收起
