that在哪些从句可以省略?哪些从句绝不可以省略?

that在哪些从句可以省略?哪些从句绝不可以省略?

一：由that引导宾语从句中（that在口语或非正式文体中常省略）.
如：
He said (that)he would like to see the teacher.
他说他喜欢去看望老师.
I think you are right.
我想你是对的.
什么是宾语从句?
答：宾语从句就是在主从复合句中作宾语,并且本身又是一个句子,故叫宾语从句.
例如：
I think （you are a good student）.
我认为你是个好学生.
二：1.that引导主语从句、表语从句、同位语从句时不能省略
2..宾语从句不止一个时,不能省略 如；they complain（that）they have to do homework from morning till night,that it is hard to study good,that they are very tired.是连续的宾语从句时,第一个可省,后面都不行.
3.宾语从句与主语之间有插入语时,不可省 如：the teacher said,happy and firmly(插入语),that we must do homework.
4.引导宾语从句是一个主从复合句 如：i belive that if i work harder,i will pass the exam.
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