精选优质文档-倾情为你奉上英语语法- 疑问词+不定式一、基本用法说明疑问词what, which, who, when, where, how及连接副词whether与不定式连用而形成一个短语，这个短语相当于一个名词，可在句中做句子的主语、宾语或表语等。如：1. 作主语。如：What to do is not decided yet. 该做什么还没有确定。How to begin is more difficult than where to stop. 如何开始比到哪里停止还困难。2. 作宾语。如：Do you know when to start? 你知道什么时候开始吗？I showed her which button to press. 我告诉她应该按哪一个按钮。有时还可用于介词后作宾语。如：I found a book on how to avoid having a heart attack. 我找到一本书谈如何避免心脏病复发。She was worried about how to fill her l
