。。1 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 leisure time. 她为如何打发她的闲暇时间而发愁。3. 作表语。如：The question is how to carry out the plan. 问题是怎样执行这个计划。The difficulty was how to cross the river. 困难在于如何过河。二、 “疑问词 +不定式 ( 短语 ) ”是一个很有用的结构，它的作用相当于一个名词性从句，通常在某些动词 ( 如 tell, know, imagine, learn, decided, forget, remember, consider, understand等) 后面做宾语，有时也用作主语、表语、同位语等。如：He didn ’t know how to answer her. 他不知道该怎样回答她。When to start has not been decided. 何时动身尚未决定。I don ’t know who to ask advice from. 我不知道应向谁征求意见。Would you please advise me which to buy? 你能否告诉我该买哪一个才好? Please explain (to me) where to begin and how to do it. 请 ( 给我 ) 解释该从哪里开始及该怎么做。。。2 They exchanged views on the question of whom to elect. 他们就该选谁的问题交换了意见。注意：按英语习惯，疑问词why 后面通常不接不定式。但在以why 或 why not 开头的省略型疑问句中，其后可跟不带to 的不定式。如：Why get upset just because you got a bad mark? 何必因为没有考好就想不开呢? You’re looking tired. Why not take a holiday? 你一脸倦容，怎么不休假呢? 三、五个易错点易错一 ：是否用于疑问词why 之后按英语习惯...
