宾语从句连接词的选择方法
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连接词的选择办法:
1)当由陈述句充当宾语从句时,用that引导,that无词义,在口语或非正式文体中常省略。如:
He said that he could finish his work before supper.他说他会在晚饭前完成工作。
2)当由一般疑问句充当宾语从句时,用if或whether引导,意为“是否”。如:
I don't know if /whether he still lives here after so many years.我不知道这么多年后他是否还住在这儿。
但在下列情况下只能用whether:
①在具有选择意义,又有or或or not时,尤其是直接与or not连用时,往往用whether(if…or not也可以使用)。如:
Let me know whether /if he will come or not.(=Let me know whether or not he will come)让我知道他是否能来。
I don't know whether /if he does any washing or not.(=I don't know whether or not he does any washing.)我不知道他洗不洗衣服。
I wonder whether we stay or whether wego.我不知道我们是去还是留。
②在 介词 之后用whether。如:
I'm interested in whether he likes English.我关心的是他是否喜欢英语。
We're thinking about whether we can finish the work on time.我们正在考虑是否能按时完成这项工作。
I worry about whether I hurt her feelings.我担心是否伤了她的感情。
③在不定式前用whether。如:
He hasn't decided whether to visit the old man.他尚未决定是否拜访那位老人。
I don't know whether to go.我不知去否。
He hasn't decided whether to go by bus or by train.他还未决定是乘公共汽车去还是坐火车去。
④whether置于句首时,不能换用if。如:
Whether this is true or not,I can't say.这是否真的我说不上来。
⑤引导主语从句和表语从句时宜用whether。如:
Whether she will come or not is still a question.她是否能来还是个问题。
The question is whether we can catch the bus.问题是我们能否赶上公共汽车。
⑥若用if会引起歧义时,则用whether。如:
Please let me know if you like the book.可理解为:
a.Please let me know whether you like the book.请告诉我你是否喜欢这本书。
b.If you like the book,please let me know.你如果喜欢这本书,请告诉我。
3)如果宾语从句原来是特殊疑问句,只需用原来的特殊疑问词引导。如:
Could you tell me why you were late for the meeting this morning?你能告诉我今天早上你为什么开会迟到吗?
1)当由陈述句充当宾语从句时,用that引导,that无词义,在口语或非正式文体中常省略。如:
He said that he could finish his work before supper.他说他会在晚饭前完成工作。
2)当由一般疑问句充当宾语从句时,用if或whether引导,意为“是否”。如:
I don't know if /whether he still lives here after so many years.我不知道这么多年后他是否还住在这儿。
但在下列情况下只能用whether:
①在具有选择意义,又有or或or not时,尤其是直接与or not连用时,往往用whether(if…or not也可以使用)。如:
Let me know whether /if he will come or not.(=Let me know whether or not he will come)让我知道他是否能来。
I don't know whether /if he does any washing or not.(=I don't know whether or not he does any washing.)我不知道他洗不洗衣服。
I wonder whether we stay or whether wego.我不知道我们是去还是留。
②在 介词 之后用whether。如:
I'm interested in whether he likes English.我关心的是他是否喜欢英语。
We're thinking about whether we can finish the work on time.我们正在考虑是否能按时完成这项工作。
I worry about whether I hurt her feelings.我担心是否伤了她的感情。
③在不定式前用whether。如:
He hasn't decided whether to visit the old man.他尚未决定是否拜访那位老人。
I don't know whether to go.我不知去否。
He hasn't decided whether to go by bus or by train.他还未决定是乘公共汽车去还是坐火车去。
④whether置于句首时,不能换用if。如:
Whether this is true or not,I can't say.这是否真的我说不上来。
⑤引导主语从句和表语从句时宜用whether。如:
Whether she will come or not is still a question.她是否能来还是个问题。
The question is whether we can catch the bus.问题是我们能否赶上公共汽车。
⑥若用if会引起歧义时,则用whether。如:
Please let me know if you like the book.可理解为:
a.Please let me know whether you like the book.请告诉我你是否喜欢这本书。
b.If you like the book,please let me know.你如果喜欢这本书,请告诉我。
3)如果宾语从句原来是特殊疑问句,只需用原来的特殊疑问词引导。如:
Could you tell me why you were late for the meeting this morning?你能告诉我今天早上你为什么开会迟到吗?
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