名词性从句考点（主语，表语，宾语）
1，that 何时可以省略
1) that 在宾语从句大多数情况可以省略
(1)We regret (that) you did not find our prouct satisfactory.
(2)We told the driver（ that） we were in a hurry.
2）在主语，表语，同位语从句中一般不能省略。
(1) That you want to be independent is only natural.
(2)The advantage of DVD is that it gives you much better picture quality.
(3)We should make people face the fact that a lot of people die from smoking every year.
2，if和whether 的区别：
1）在宾语从句中，if 和whether一般都可以使用.
在宾语从句中， 只能使用whether的情况：
(1) 介词之后
Your success or failure depends on whether you work hard.
(2) 紧跟or not 时
She asked me whether or not he would come.
(3)接不定式
Can you tell me whether to go or to stay ?
(4) 主语从句，表语从句， 同位语从句只能用whether.
Whether I will come depends on a number of things. The question is wether he will come to help.
