宾语从句if和whether怎么改

宾语从句if和whether怎么改？

(1)whether和if在宾语从句中可以互换,但是作介词宾语时连接词一般用whether。

It all depends on whether they will come back.

(2)后面直接跟or not 时用whether。

I didn’t know whether or not he had arrived in Wuhan.

(3)主语从句、表语从句中只能用whether。

Whether the meeting will be put off has not been decided yet.

The question is whether they have so much money.

(4)whether可以引导同位语从句,用以说明前面的名词的内容,if则不能。

We ought to discuss carefully the question whether we can do it or not.

(5)whether常与or连用表示一种选择,if不能这样用whether也可与动词不定式连用,但if不能。

The question of whether they are male or female is not important.

I have not decided whether to go or not.

(6)宾语从句位于句首时或者宾语从句提前时用whether不用if。

Thank you,but whether I’ll be free I’m not sure at the moment.

(7)whether可引导一个让步状语从句表示“不管”、“无论”,而if不能。

Whether he comes or not,we will begin our party on time.

由whether(if)引导的宾语从句，实际上是一般疑问句演变而来的。意思是“是否”。

宾语从句要用陈述句语序。一般说来，在宾语从句中whether与if可以互换使用，但在特殊情况下if与whether是不能互换的。

例句：I wonder whether(if) they will come to our party.

只能用whether，不能用if引导的宾语从句

在带to的不定式前

例句：We decided whether to walk there.

在介词的后面

例句：I’m thinking of whether we should go to see the film.

在动词后面的宾语从句时

例句：We discussed whether we had a sports meeting next week

直接与or not连用时

例句：I can’t say whether or not that can come on time.

只能用if不能用whether引导的宾语从句

if引导条件状语从句，意为“如果”

例句：The students will go on a picnic if it is sunny.

if引导否定概念的宾语从句时

例句：He asked if I didn’t come to school yesterday.

引导状语从句even if（即使）和as if（好象）时

例句：He talks as if he has known all about it.

连词if和whether在宾语从句中都解释为“是否”，如果从句本身是一般疑问句则用if或whether连接。

如：Is he a teacher? I asked改成宾语从句则是I asked if/whether he was a teacher.