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Step1. What's the Object Clause? (什么是宾语从句)
I know the man. → I know that the man is a policeman.
She will come back in an hour. → I'm asking if she will come back in an hour.
Summary: 在复合句中，做介词或者动词的________的句子就叫做宾语从句
Step2. 不同引导词引导的宾语从句
Task1. 由从属连词that引导的宾语从句
He says
Tom is a good student
He said
He had a car accident yesterday
Summary: 由that 引导的宾语从句，that在从句中不充当成分，没有词意，所以常省略。而且它是由陈述句转化而来的。
that引导__________的宾语从句，经常省略.
Task2. 由从属连词if,whether引导的宾语从句
I don't know
Will she come here?
He asked
Has she finished her homework?
Summary:由连词if/whether引导的宾语从句，引导词在从句中具有实际意义(是否)，但不做任何成分，所以不能省略。它是由一般疑问句转化而来的表示不肯定的语气。
whether, if 引导_____________句的宾语从句
一般情况下if和whether可以互换，但在以下情况只能用whether。
1.在介词后引导宾语从句时；
He was worried about whether he could pass the English exam
2.和or not连用时；
I want to know whether he is free or not
3.和动词不定式连用时；
I asked him whether to sit beside me
Task3. 由连接代词what, which, who, whom, whose, 及连接副词 when, where, how, why引导的宾语从句.
I don't know
When does the train leave?
She asked