This question is too difficult for me to answer.为什么后面不要it呢?

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This question is too difficult for me to answer.为什么后面不要it呢?

因为this question 是answer的逻辑宾语,故不再用it.也可以这样说:It is too difficult for me to answer this queston.

因为如果是
It is difficult for sb. to do sth.
这个时候需要把sth.加出来,因为it做形式主语,后面真正的主语是某人做某事有困难
而这句,前面不是形式主语It,而是question,说明answer已经有了宾语,就是question,不许要再加上宾语it了

This question is too difficult for me to answer.
因为answer 的宾语this question已前置!

it代指the question 并提前

too...to句型to后根动词to do sth