从句一般有省的可能的
如宾语从句的一般句,也就是除去我上面讲的 如：he said (that) I must do homework.
定语从句 如果不是强调句 一般也都可省 如：I don't like the way (that)you speak to her. 这里的that就可以省略什么都不填
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. 这个有点难度,一般不会出现我想..
还是有点局限 你可以问问你们老师