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注意事项 :在以下情况中 that 不能省略
1)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.
2)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.
He said (that) the sun is much bigger than the moon.
2) 宾语从句的语序