【1】名词性从句包括主语、宾语、表语、同位语从句,没有状语从句.请注意区分!你说的where等词,叫连接副词,what等词叫连接代词.Where the English evening will be held has not yet been announced.这就是一句主语从句,where 引导的.【2】缺什么成分?就是缺主语、宾语、表语、同位语的时候都可以用这些词啊.比如whether这个词：主语：Whether the plan is feasible remains to be proved.这一计划是否可行还有待证实.宾语：Let us know whether / if you can finish the article before Friday. 请让我们知道你是否能在星期五以前把文章写完.表语：The point is whether we should lend him the money. 问题在于我们是否应该借钱给他.同位语：They are investigating the question whether the man is trustworthy. 他们调查他是否值得信赖.名词性从句里的连接词上辈子都是折翼的天使,不仅伤不起,还神通广大.【3】这道题的玄机就在那个低调的逗号上.如果想填to wait,可以有以下两种改法：①去掉逗号The basketball fans jammed outside the hotel to wait for Yao Ming to turn up.
②或者 To wait for Yao Ming to turn up,the basketball fans jammed outside the hotel .想要非谓语动词中 动词不定式做目的状语,那么动词不定式只有以上两种位置：句末不加逗号或句首加逗号.如果不明白欢迎继续追问!