宾语从句
一、定义
在句子中起宾语作用的从句叫做宾语从句。
二、连接词
that: i think that you can pass the exam.
whether/if: i don’t know what the word means.
“wh”: i don’t know what

the word means.
i don’t know where he found the book.
只用whether的情况：
1. 与or not连用：
i don’t know whether it’s raining or not.
2. 与动词不定式连用：
he doesn’t know whether to accept the invitation.
3. 连接词前有介词时：
it depends on whether he is coming.