[求助]whether 和 if 在作从句引导词时的区别取舍

好像找不到这个知识点的归纳？请问有吗？谢谢。

the same question need to solve

whether 与 if 的区别

1 whether 可引导名词性从句，作主语。If
不能。
                

Whether he comes or not has nothing to do with us . 

2
            介词之后用whether
,不用if .   

It depends on
whether you will agree .

3
            不定式前面用whether
不用if . 

 I wonder
whether to stay here .

4
            用or 表示选择用whether ，不用if .

 He wondered
whether he should wait or go .

5
            当从句放主句前，用whether
，不用if .

 Whether this is true or not, I can’t say
.

6
            引导表语从句用whether
，
            不用 if . 

The problem is whether
we should go home or not .

7
            句中有or not 时，用whether ，
            不用if . 

I wonder whether it is big enough or not  .

8
            作discuss 的宾语，用whether ，
            不用if . 

They are
discussing whether they should open the door .