whether,if 的用法和区别如题

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whether,if 的用法和区别如题
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whether,if 的用法和区别如题
whether,if 的用法和区别
如题

whether,if 的用法和区别如题
whether和if的用法区别
whether与if作“是否”讲,在用法上有相同之处,也有不同之处.
一、相同之处.
1.whether和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后.
如:He asked me whether/is I could help him.I want to know whether/if he lives there.
2.whether和if都可用it作形式主语从句中.如:it's uncertain whether/if he'll come this evening.
3.在be uncertain/doubtful之后,常用whether引导宾语从句,有时也可以用if,如:We are uncertain whether/if Mary will come.
二、不同之处.
1.whether可置于句首引导主语从句,而if不能.如:___the 2000 Olympic Games will be in Beijing is not known yet.A.whether B.If C.Whether D.That 答案是C.
2.whether可用在介词之后,引导宾语从句,而If则不能.如:Success depends on whether we make evough effort.
3.whether可引导表语从句,if则不能.如:The puestion is whether it is not worthdoing.
4.在名词之后引导同位语从句时,用whether而不用if.如:The puestion whether the students answered correctly should be decided by the teacher.
5.whether后可接不定式,而if不能.如:Please tell us whether to go or stay here.
6.在有些动词(如discuss)之后,只能用whether,而不用if引导宾语从句.如:We discussed whether we should close the shop.
7.在引导否定概念in宾语从句时,只能用if,而不用whether.如:he asked me if I hadn't finished my work.

whether与if作“是否”讲,在用法上有相同之处,也有不同之处。
一、相同之处。
1.whether和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。
如:He asked me whether/is I could help him. I want to know whether/if he...

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whether与if作“是否”讲,在用法上有相同之处,也有不同之处。
一、相同之处。
1.whether和if都能引导宾语从句,常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。
如:He asked me whether/is I could help him. I want to know whether/if he lives there.
2.whether和if都可用it作形式主语从句中。如: it's uncertain whether/if he'll come this evening.
3.在be uncertain/doubtful之后,常用whether引导宾语从句,有时也可以用if,如: We are uncertain whether/if Mary will come.
二、不同之处。
1.whether可置于句首引导主语从句,而if不能。如: ___the 2000 Olympic Games will be in Beijing is not known yet. A.whether B.If C.Whether D.That 答案是C。
2.whether可用在介词之后,引导宾语从句,而If则不能。如: Success depends on whether we make evough effort.
3.whether可引导表语从句,if则不能。如: The puestion is whether it is not worthdoing.
4.在名词之后引导同位语从句时,用whether而不用if。如: The puestion whether the students answered correctly should be decided by the teacher.
5.whether后可接不定式,而if不能。如: Please tell us whether to go or stay here.
6.在有些动词(如discuss)之后,只能用whether,而不用if引导宾语从句。如: We discussed whether we should close the shop.
7.在引导否定概念in宾语从句时,只能用if,而不用whether.如:he asked me if I hadn't finished my work.
whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用。如:
I wonder if / whether I can get some advice from you.
Ask him whether / if he can come.
但在有些情况下,whether和if的用法有一定区别。
1. whether引导的从句常可以与连词or或or not直接连用,而if一般不能。如:
正: Let me know whether you can come or not.
误: Let me know if you can come or not.
2. 当宾语从句提到句首时,只能用whether引导,而不能用if。如:
正: Whether it is true or not, I can’t tell.
误: If it is true or not, I can’t tell.
3. whether可以引导带to的不定式,if则不能。如:
正: I don’t know whether to accept or refuse.
误: I don’t know if to accept or refuse.
4. whether及其引导的成分可放于介词之后,作介词的宾语,但if不能。如:
正: I worry about whether I hurt her feelings.
误: I worry about if I hurt her feelings.
5. whether可以引导从句,作主语、表语或同位语,而if不能。如:
正: It was uncertain whether he would come.
误: It was uncertain if he would come.
正: His first question was whether Tom had arrived yet.
误: His first question was if Tom had arrived yet.
正: We must consider the question whether we will take these measures.
误: We must consider the question if we will take these measures.
要区别whether和if很简单,whether引导宾语从句是翻成”是否”后面一般接or not,如果后面没有or not就可以用if代替.
if可以引导宾语从句也可以引导条件状语从句.可以翻中文来区别,条件状语从句一般翻成”如果”,宾语从句翻成”是否”.if引导的条件状语从句用一般现在时代替将来时.
例如:我不知道他是否会来,如果他来,我将会打电话给你.
--I don't know if he will come,if he comes I will call you.

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