賓語從句中的that可以省略,定語從句中假如引導詞that在從句中充當賓語,可以省略. 例如：賓語從句：I promise that I will study hard.這裡的that可以省略 定語從句 This is the factory that we visited yesterday.這裡的that可以省略 但是在這句中：This is the factory that lies in Guangzhou.這裡的that做主語,不能省略. 以下情況不可省略
1.that引導主語從句、表語從句、同位語從句時不能省略
2.賓語從句不止一個時,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.是連續的賓語從句時,第一個可省,後面都不行.
3.賓語從句與主語之間有插入語時,不可省 如：the teacher said,happy and firmly(插入語),that we must do homework.
4.引導賓語從句是一個主從複合句 如：i belive that if i work harder,i will pass the exam. 這個有點難度,一般不會出現我想..
賓語從句中的that可以省略,定語從句中假如引導詞that在從句中充當賓語,可以省略. 例如：賓語從句：I promise that I will study hard.這裡的that可以省略 定語從句 This is the factory that we visited yesterday.這裡的that可以省略 但是在這句中：This is the factory that lies in Guangzhou.這裡的that做主語,不能省略. 以下情況不可省略
1.that引導主語從句、表語從句、同位語從句時不能省略
2.賓語從句不止一個時,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.是連續的賓語從句時,第一個可省,後面都不行.
3.賓語從句與主語之間有插入語時,不可省 如：the teacher said,happy and firmly(插入語),that we must do homework.
4.引導賓語從句是一個主從複合句 如：i belive that if i work harder,i will pass the exam. 這個有點難度,一般不會出現我想..