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一、定義

在句子中起賓語作用的從句叫做賓語從句。

二、連接詞

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的情況：
1. 與or not連用：
I don’t know whether it’s raining or not.
2. 與動詞不定式連用：
He doesn’t know whether to accept the invitation.
3. 連接詞前有介詞時(shí)：
It depends on whether he is coming.

三、時(shí)態(tài)

1. 主句是一般現(xiàn)在時(shí)態(tài)，從句根據(jù)實(shí)際情況而定(各種時(shí)態(tài)均可)
She wants to know what he has done for the exam.

2.主句是一般過去時(shí)態(tài)，從句用相應(yīng)的過去的時(shí)態(tài)。
1）She said that she was a student.
2）She said that she would fly to Japan in a week.
3）She said that she had finished her homework already.

3. 如果賓語從句說的是客觀真理、自然現(xiàn)象或事實(shí)時(shí)，這時(shí)賓語從句要用一般現(xiàn)在時(shí)態(tài)。
The teacher said that the earth goes round the sun.