2019高考进行备考阶段，考高分教育网小编整理了2019高考英语语法考点聚焦：名词性从句中连接词的运用(2)，供同学们参考。
2019高考英语语法考点聚焦：名词性从句中连接词的运用(2)
whether和if的用法。
①whether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。如：
It all depends on whether they will come back.
②后面直接跟or not 时用whether。如：
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。如：
Whether the meeting will be put off has not been decided yet.
The question is whether they have so much money.
④whether可以引导同位语从句，用以说明前面的名词的内容，if不能。如：
We ought to discuss carefully the question whether we can do
it or not.
⑤whether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。如：
The question of whether they are male or female is not important.
I have not decided whether to go or not.
⑥间接引语位于句首时或者是间接引语提前时用whether不用if。如：
Thank you, but whether I’ll be free I’m not sure at the moment.
⑦whether可引导一个让步状语从句表示“不管”、“无论”，而if不能。如：
Whether he comes or not, we will begin our party on time.
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