賓語從句
1.that引導賓語從句無意義,不充當句子成分常省略.但下列情況除外：
（1）介詞賓語從句的that不省略
（2） and連接的幾個從句,第二個從句以后的從句的that不省略.
He told me that he had two sons and that they both had gone to college.
（3）在動詞+it+賓語補足語+賓語從句結(jié)構(gòu)中,that不省略.
I heard it said that he had gone abroad
We found it impossible that he could finish it in such a short time
2.Whether ,if 引導賓語從句：兩詞可互換,但是下列情形除外：
（1）whether從句中有or not
（2）whether從句做介詞賓語
Everything depends on whether you agree with us
3.許多帶復(fù)合賓語的句子,賓語從句經(jīng)常移到句子后部,而用it做形式賓語.結(jié)構(gòu)常是：
主語+動詞+it+形容詞/名詞等賓語補足語+賓語從句
We think it wrong that he told a lie to everyone
4.賓語從句的語序要用陳述句語序