第1个回答 2013-09-12
这些词可以构成插入语,含think, suppose, guess, say, imagine, expect, believe等动词的疑问句,后接含疑问词的宾语从句时,要将疑问词放在句首。例如:
Whom do you think I should see first?
这一结构可改为:Whom should I see first, do you think?
He made another wonderful discovery, ________of great importance to science.
A. which I think is B. which I think it is
C. which I think it D. I think is [Key: A]
这里I think是插入语。which引导非限制性定语从句,故选A。 think与believe引导的句子是宾语从句宾语从句中的时态,通常分三种情况:若主句为一般现在时或一般将来时,宾语从句可根据具体情况选用时态;若主句是过去时,从句一般用相应的过去时态;若从句表示的是客观真理、名言、自然现象等,从句时态不受主句限制。 所以,并不是主句为过去时,从句就一定得用相应的过去时