判断方法：

1、可以从整个句式看。状语从句一般可以放在主句的前面或后面(个别除外)，宾语从句只能放在主句谓语动词之后。

2、从引导词看。if充当宾语从句的连接词时，相当于whether， 词义为“是否”，充当状语从句的连接词时，词义为“如果”。when充当

宾语从句的连接词时，意为“什么时候”， 充当状语从句的连接词时，意为“当……的时候”

3.从时态看。if和when作连接词时，引导宾语从句要注意：从句的谓语动词的时态应根据主句的时态作相应的变化。if和when充当从属连

词时，引导条件和时间状语从句，若主句的谓语动词用一般将来时，则从句的时态应用一般现在时表示将来。

e.g. I think (that) differences are not important in a friendship.

An old lady said (that) she found a job as a foreign language teacher.

They don’t know if (是否)we are going hiking next weekend

Could you tell me when (什么时候)the train arrives ?

We’ll go to the Great Wall if (如果) it doesn’t rain tomorrow.

=If doesn’t rain tomorrow, we’ll go to the Great Wall.

They knew each other when(当……时候)they were children.

=When they were children

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