选词填空：when，why，how，which，what，who，whom

　　①Do you know when the train arrives.

　　②Can you tell me why you chose the topic to write an article.

　　③How I can make greater progress later is a problem.

　　④Which team will win is not clear.

　　⑤What I want to know is who took away my book.

　　⑥The problem is whom we should have do it.

　　3．what与that的用法区别

　　(1)that只起连接作用，在从句中不充当任何成分，也无任何意义。

　　(2)what引导从句，除起连接作用外，还在从句中作主语、宾语、表语等成分，这时what具有两个含义：

　　①保留疑问的意义，即"什么；什么样的"；

　　②相当于"the thing(s) that/which"，即"先行词＋定语从句"的含义。

　　另外，what的此种用法还可以表示时间(the time that)、地点(the place that)、人物(the person that)、数目(the amount/number that)等不同概念。

　　You can have what you like.

　　你喜欢什么就拿什么吧。

　　The trouble is that she has lost his address.

　　麻烦在于她弄丢了他的地址。

　　After what seemed a long wait，the results were announced.

　　经过了似乎漫长的等待之后，结果被宣布了。

　　[即时演练2]　单句改错

　　①That the professor said is of great importance.

　　That→What

　　②The key is that we can get from it.that→what

　　③He saves that he earns.that→what

　　④I know the fact what he came here two years ago.

　　what→that

　　4．"疑问词＋­ever"与"no matter＋疑问词"的用法区别

whoever，whatever，whichever等既可引导名词性从句又可引导让步状语从句