名词接to do,动词不定式作名词的定语,如： He is the first to come and the last to go. 疑问词后接动词不定式,构成一种特殊的动词不定式短语,在句中,可以作主语、表语、宾语等.如： How to fight pollution is a problem. I don't know whether to refuse it or not. I asked him how to study English. The problem is how to read the word when it's from French. 希望我能帮助你解疑释惑.
