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注意事项：在以下情况中that不能省略
当句中的动词后接两个或两个以上由that引导的宾语从句时，第一个that可省，但后面的that不可省。
例句：He said (that) you were too young to understand the matter and that he was asked not to tell you.
当that从句是双宾语中的直接宾语时，that一般不可省略。
例句：I can’t tell him that his mother died.
B 由连词if、 whether 引导的表示“是否…”的宾语从句。whether, if 在从句中不做句子的成分，一般情况下，whether和if 可以替换。
例：I don’t know if/whether he will come tomorrow.
The teacher asked if/whether we had finished the experiment.
注意事项：在以下情况中只能用whether
1) 在介词后面的宾语从句中不用if引导
例：Everything depends on whether we have enough money。
2)宾语从句中有or not时不用if引导.
例：I don’t know whether the movie star will come or not.
3)和不定式连用作宾语时不用if引导.
例：I don’t know whether to stay here for dinner.
4)whether 放句首时不用if 引导
例：Whether they will join us in the picnic, I don’t care.
C 由wh-引导的宾语从句。连接代词who, whom, whose, what, which,和连接副词when, where, why, how 等连接的宾语从句，它们在句中即有连接从句的作用，又在句中充当句子的成分。
例：You must take back what you said. (what做宾语)
I don’t know where he lives. (where 做地点状语)
3. 宾语从句中需注意的问题
1） 时态
A 主句是现在的时态，从句时态不受限制，并根据实际情况定。
例： I hear (that) Tom will come back tomorrow.
She says Jim went to work an hour ago.
B 主句是过去的时态，从句也要用过去的时态。
例： He said (that) he had had supper already.
He said (that) he was reading a book.
C 如果从句说明的是客观存在的事实或真理，从句不受主句限制，一律用一般现在时。
例：My father told me that no news is good news.