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（1）由that引导的宾语从句。that只有语法作用，没有实在的意义，在口语和非正式文体中可以省略。Eg： He said (that) he wanted to stay at home.
(2)不能省略that 的情况：
A. 当句中的动词后接多于两个由that引导的宾语从句时，第一个that可省，但后面的that不可省。
I believe（that）you have done your best and that things will get better．
B. 当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。
Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.
C. 当that从句是双宾语中的直接宾语时，that不可省。 I can’t tell him that his book is missing D、当it作形式宾语时
例句：She made it clear that she had nothing to do with him． E、当宾语从句前置时 That our team will win，I believe．
F.当that作learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时; 由if或whether引导的宾语从句。if和whether在句中的意思是“是否”。
Eg: I want to know if (whether) he lives there.
He asked me whether (if) I could help him.
(3)但在下列情况下只能用whether，不能用if：
A. 在具有选择意义，又有or或or not时，尤其是直接与or not连用时，往往用whether（if…or not 也可以使用）。如：
Let me know whether ／if he will come or not．（＝Let me know whether or not he will come）I don't
B. 在介词之后用whether。如：
I'm interested in whether he likes English．我关心的是他是否喜欢英语。
We're thinking about whether we can finish the work on time．我们正在考虑是否能按时完成这项工作。
C. 在不定式前用whether。如：
He hasn't decided whether to visit the old man．他尚未决定是否拜访那位老人。
D. whether置于句首时，不能换用if。如：
Whether this is true or not，I can't say．这是否真的我说不上来。 E. 引导主语从句和表语从句时宜用whether。如：
Whether she will come or not is still a question．她是否能来还是个问题。
F. 若用if会引起歧义时，则用whether。如：
Please let me know if you like the book．可理解为：
If you like the book，please let me know．你如果喜欢这本书，请告诉我
(4)只能用if不能用whether引导的宾语从句
A. if引导条件状语从句，意为―如果‖。
eg: The students will go on a picnic if it is sunny.
B. if引导否定概念的宾语从句时。
eg: He asked if I didn’t come to school yesterday.