④Let me know whether or not you can come.

　　⑤I don't know if/whether he still lives there after so many years.

　　⑥We are interested in whether you will attend the meeting.

　　⑦Give me your promise that you will come to our party this evening.

　　⑧He has made it clear that he will not give in.

　　3．疑问词who, whom, whose, what, which, where, why, when, how

　　疑问词引导的名词性从句由特殊疑问句转化而来。它们的特点是：

　　(1)疑问词保留自己的疑问含义；

　　(2)疑问词在从句中担当句子成分，如主语、宾语、定语或状语；

　　(3)这种疑问词引导的从句一律用陈述语序，不能用疑问语序。

　　Do you know whom they are looking for?

　　你知道他们在找谁吗？

　　I don't know who did it.

　　我不知道这是谁干的。

　　[即时演练2]　选词填空

　　①I have no idea why Mike refused an offer from Yale University; that's one of his favorite universities.

　　②These shoes look very good. I wonder how much they cost.

　　③When the delayed flight will take off depends much on the weather.

　　④If it is what we need, we will buy it.

　　⑤The problem is who we can get to solve this question.

　　⑥A straw shows which way the wind blows.

　　⑦Have you decided whom you are to elect as your assistant?

　　⑧I wonder whose this is.

　　⑨I don't know where Lu Xun once lived.

　　4．whatever, whichever, whoever, whomever引导名词性从句的用法

　　whatever, whichever, whoever, whomever可引导主语从句、宾语从句和表语从句，并在从句中作主语、宾语和表语等。在此用法中whatever, whoever等在从句中通常不含疑问意义。whatever ＝ anything that, whoever ＝ anyone who。

　　I will just say whatever comes into my mind.

　　我想到什么就说什么。

Whoever breaks the rules will be punished.