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一、宾语从句的连接词
1.连词that，只起连接作用，在从句中不作句子成分，也无词汇意义，在口语中常被省略。
eg. He knew (that) he should work hard.
2.连词if 、whether，它们起连接作用，在从句中不作句子成分，作“是否”解，在口语中多用if。
eg. Tom don't know if/whether his grandpa liked the present.
He asked me whether or not I was coming.
一般情况下，if 和whether可以互换，但以下4种情况只能用whether：
①在不定式前：Whether to go there or not hasn't been decided.
②在介词前：It depends on(依靠) whether it is going to rain.
③与or not连用：They are talking about whether to go there or not.
④作主语只能用whether：Whether he will come is not decided.
3.连接代词who, whom, whose, what, which，连接副词when, where, why, how， 它们起连接作用，作句子成分，各有自己的意义。
eg. The teacher asked the new students which class he was in.
I wonder where he got so much money.
二、宾语从句的语序 ：
若由一般疑问句或特殊疑问句变为宾语从句，应该用陈述句语序。注意：当助动词是 does 或 did 时，要去掉助动词，并把动词恢复为第三人称单数形式或过去式；当是情态动词或其它的助动词时，则要把这些情态动词或助动词放在主语的后面。
?I asked Tom , “ What do you like best ? ”
?—?? I asked Tom what he liked best .
The teacher asked me : “ Have you read the book ? ”
?— The teacher asked me if I had read the book .
三、宾语从句时态(由主句的时态来确定)
宾语从句中谓语动词的时态，常常受到主句谓语时态的制约，此为时态呼应。如果主句谓语是一般现在时或将来时，从句谓语的时态不受限制;如果主句谓语的时态是一般过去时，从句一般要随着改为相应的过去时态(一般过去时、过去进行时、过去将来时、过去完成时)。
eg. I thought (that) you are free today. (╳)
I thought (that) you would be free today. ( √)
四、特殊性原则
如果宾语从句所陈述的是客观事实、真理或自然现象，公式定理，名言警句等，即使主句用了过去时，从句仍用 一般现在时态
The teacher told us that the earth goes around the sun.
He told me (that)Summer is after Spring .
五、宾语从句的否定前移
宾语从句的否定形式 ：