whether 和if,作为“是否”的意思,有什么区别吗?有什么特定用法吗、?
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发布时间:2022-05-14 20:01
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热心网友
时间:2023-10-27 12:12
OK,知识很多,我先占个楼,慢慢讲。
1,whether和if常用来引导宾语从句,这时两者的含义区别很小,一般可通用。(这里需要注意的是:如果是whether.......or not的搭配,那就不能通用。)
例子:
I don't know whether/if they will come to help us.
2,只能用whether的情况:
A:在介词后面
(This depends upon whether we are determined to do it.)
B:动词不定式之前
(She doesn't knows whether to get married now or wait.)
C:在及物动词后的宾语从句中(We discussed whether we should make a change in our plan.)
D:引导主语从句
(Whether the news is true remains a question.)
E:引导表语从句
(What we want to know is whether he will come to speak to us tomorrow.)
F:引导同位语从句,常用whether
(The question whether we'll build another lecture building hasn't been settled.)
小结一下上面的:其中CDEF条合起来统称名词性从句需要用whether
3,只能用if的情况:
A:表否定的宾语从句
(He considered if he shouldn't tell her the secret.)
热心网友
时间:2023-10-27 12:13
你好,以下是只用WHETHER不能用IF 的情况:
1.在介词后面时;
2,与or not连用时;
3.引导主语从句时;
4.引导表语从句时;
如下面的句子:
I am worried about whether he is safe.
He didn't know whether he should go or not.
Whether he will come is unknown.
The question is whether he will come.
只用用IF,不能用WHETHER的情况:
If it rains tomorrow, they will not go out.
热心网友
时间:2023-10-27 12:13
1) 在引导主语从句时,一般用whether,而不用if。
例如 Whether the German engine was the first to fly is not clear.
并不清楚是否是德国发动机首先用于飞机的。
备注 在口语中,if也可以用于主语从句,但必须放句尾,看似是个宾语或表语从句。
2) 在引导宾语从句时,一般情况下whether和if可以通用。
例如 The policeman asked if / whether I had seen the accident.
*问我是否看见这场事故。
3) 只用whether的情况
例 1 He asked whether I wanted to go by air or by sea.
他问我是想坐飞机还是坐船去。
(从句中含有or,强调选择,这里只宜用whether)
例 2 He asked whether or not I wanted to insure my luggage.
他问我是否想给行李保险。
(只有whether后面可以直接跟 or not)
例 3 Bill asked whether, if I got the job, I’d move to New York.
比尔问我如果找到工作,是否要搬到纽约去。
(宾语从句中包括一个if从句,则宜用whether)
例 4 We discussed whether we should go there.
我们讨论了我们是否应该去那里。
(在discuss等动词后,只能用whether)
热心网友
时间:2023-10-27 12:14
(那么在名词性从句中有whether和if的区别要另当别论)。虚拟语气中if的用法如下: 1.表示对现在的假设:if应到的从句用——did 主句用——would do
热心网友
时间:2023-10-27 12:14
当是否时,whether和or not连用,if不能
热心网友
时间:2023-10-27 12:12
OK,知识很多,我先占个楼,慢慢讲。
1,whether和if常用来引导宾语从句,这时两者的含义区别很小,一般可通用。(这里需要注意的是:如果是whether.......or not的搭配,那就不能通用。)
例子:
I don't know whether/if they will come to help us.
2,只能用whether的情况:
A:在介词后面
(This depends upon whether we are determined to do it.)
B:动词不定式之前
(She doesn't knows whether to get married now or wait.)
C:在及物动词后的宾语从句中(We discussed whether we should make a change in our plan.)
D:引导主语从句
(Whether the news is true remains a question.)
E:引导表语从句
(What we want to know is whether he will come to speak to us tomorrow.)
F:引导同位语从句,常用whether
(The question whether we'll build another lecture building hasn't been settled.)
小结一下上面的:其中CDEF条合起来统称名词性从句需要用whether
3,只能用if的情况:
A:表否定的宾语从句
(He considered if he shouldn't tell her the secret.)
热心网友
时间:2023-10-27 12:13
你好,以下是只用WHETHER不能用IF 的情况:
1.在介词后面时;
2,与or not连用时;
3.引导主语从句时;
4.引导表语从句时;
如下面的句子:
I am worried about whether he is safe.
He didn't know whether he should go or not.
Whether he will come is unknown.
The question is whether he will come.
只用用IF,不能用WHETHER的情况:
If it rains tomorrow, they will not go out.
热心网友
时间:2023-10-27 12:13
1) 在引导主语从句时,一般用whether,而不用if。
例如 Whether the German engine was the first to fly is not clear.
并不清楚是否是德国发动机首先用于飞机的。
备注 在口语中,if也可以用于主语从句,但必须放句尾,看似是个宾语或表语从句。
2) 在引导宾语从句时,一般情况下whether和if可以通用。
例如 The policeman asked if / whether I had seen the accident.
*问我是否看见这场事故。
3) 只用whether的情况
例 1 He asked whether I wanted to go by air or by sea.
他问我是想坐飞机还是坐船去。
(从句中含有or,强调选择,这里只宜用whether)
例 2 He asked whether or not I wanted to insure my luggage.
他问我是否想给行李保险。
(只有whether后面可以直接跟 or not)
例 3 Bill asked whether, if I got the job, I’d move to New York.
比尔问我如果找到工作,是否要搬到纽约去。
(宾语从句中包括一个if从句,则宜用whether)
例 4 We discussed whether we should go there.
我们讨论了我们是否应该去那里。
(在discuss等动词后,只能用whether)
热心网友
时间:2023-10-27 12:14
(那么在名词性从句中有whether和if的区别要另当别论)。虚拟语气中if的用法如下: 1.表示对现在的假设:if应到的从句用——did 主句用——would do
热心网友
时间:2023-10-27 12:14
当是否时,whether和or not连用,if不能