关于if从句求解

来源:百度知道 编辑:UC知道 时间:2024/06/03 21:39:48
What did the woman ask just now?
She asked __________
答案是 whether I could help her to find the post office

可是我就疑惑了,这里whether不是相当于if吗?if接从句表是否不是要加will吗?那这里不应该是I would help才对啊?
求解!!
我承认我有点白痴,绕了。说详细点,我混在了这个句式里
I don't know if he will come.If he comes,I'll tell you.
我记得很清楚,就是表是否的时候一定要用will.麻烦各位给我说说,有什么别的情况,怎么记忆,谢谢

= =v1.2

那个回答的同学,我是混在了I don't know if he will come.这里不也是是否的意思咩??

这里两个可互换,没有说If要用法will啊

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