the teacher asked Ben ___(answer)a difficult question适当形式

来源：学生作业帮编辑：灵鹊做题网作业帮分类：英语作业时间：2024/04/29 07:00:47

应该填to answer（动词不定式）
Ask somebody to do something是一个固定的动词用法
再问：什么时候才用动词不定式呢？
再答：楼主提到的情况是ask的一个固定用法。英语里很多动词像ask一样后面只能接动词不定式，比如want, hope,choose,等等。这些都是需要特别记住的。在英语语法里面，不定式一般用作目的状语，为一个动作做一个目的的补充说明。比如：I went to the bus station to meet Ann. (我去了车站去见Ann) , to meet Ann( to 后面加一个动词原形）这个不定式就是做went to the bus station的目的状语。

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