a. They knew that the habit may kill them.

　　b. What he wanted to see (他想看到的事)was an end to all the armies of the world.

　　c. Nicotine! Thats what the smokers need.(抽烟者所需要的东西)

　　四.引导名词从句时只用whether, 不用if的情况:

　　1.引导主语从句时:

　　a. Whether the 2000 Olympic Games will be held in Beijing is not known yet.

　　2.引导表语从句时:

　　a. The problem is whether we need it.

　　3.引导介词后的宾语从句时:

　　a. He was worried about whether he passed the exam.

　　4.与or not连用时:

　　a. It doesnt matter whether she will come or not.

　　5.置于不定式之前时:

　　a. I dont know whether to go.

　　6.引导同位语从句时:

　　a. The problem whether well build another school hasnt been settled.

　　五.名词从句的语序问题: 名词从句中都要使用陈述语序, 参看前文例句

　　2.引导表语从句时:

　　a. The problem is whether we need it.

　　3.引导介词后的宾语从句时:

　　a. He was worried about whether he passed the exam.

　　4.与or not连用时:

　　a. It doesnt matter whether she will come or not.

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