连接代词who, whom, which等，如：
Do you know who (whom) they are waiting for? 连接副词when, where, how, why等，如： Could you tell me how we can get to the station? 2、由that引导的宾语从句，如：
I don’t know (that )Tom was late again
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I am afraid (that) it would rain soon 注意1:引导宾语从句的that 常可以省略,但下列情况下不能省略。 （1）and连接两个或两个以上的宾语从句，除第一个从句中的that以外,后面从句中的that不能省略。
如：Everybody could see what happened and that Tom was frightened.
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（2）that引导的宾语从句作介词宾语时，that不能省略。如：
I know nothing about him except that he is from the south. （3）主句谓语动词与that从句之间有插入语，that不可省略。
如：We decided,
considering his age, that we would not let him do the job.
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注意2:若有补语，则宾语从句要放到补语之后，在宾补前用形式宾语it. 如：He doesn’t want it to be known that he is going away.
I consider it
necessary that he should do it again.
注意3: 否定转移. 在think, believe, suppose, expect 等动词后的宾语从句，从句中的否定往往在主句中体现。如：
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