1.that引导宾语从句无意义,不充当句子成分常省略.但下列情况除外：（1）介词宾语从句的that不省略
（2） and连接的几个从句,第二个从句以后的从句的that不省略.He told me that he had two sons and that they both had gone to college.（3）在动词+it+宾语补足语+宾语从句结构中,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 引导宾语从句：两词可互换,但是下列情形除外：
（1）whether从句中有or not
（2）whether从句做介词宾语 Everything depends on whether you agree with us
3.许多带复合宾语的句子,宾语从句经常移到句子后部,而用it做形式宾语.结构常是：主语+动词+it+形容词/名词等宾语补足语+宾语从句 We think it wrong that he told a lie to everyone
4.宾语从句的语序要用陈述句语序
False:He is wondering when can he finish this difficult job.Right:He is wondering when he can finish this difficult job.
B 有时候可以用it 作形式宾语,而把真正的宾语从句放在后面.
Bad:I thought that he could finish this job in just two hours impossible.
Good:I thought it impossible that he could finish this job in just two hours.
Bad:He left whether we should continue this project to my judgment.Good:He left it to my judgment whether we should continue this project.
C 带有宾语从句的复合句的否定形式一般是否定主句.
Bad:I think he doesn’t like the English teacher.
Good:I don’t think he likes the English teacher.
D 主句一般过去时态,从句也要用过去时态；具体细节请看第一部分.False:He wanted to know why he is crying in the corner.
Right:He wanted to know why he was crying in the corner.bu
哪些宾语从句不可以省略引导词that
1当that做learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时;
2当宾语从句较长时;
3当主语状语置于主句尾,宾语从句之前时;
4当主语谓语动词(包括非谓语动词)与宾语从句之间有插入语时;
5当一个动词带有两个或两个以上宾语从句时,此时第一个that可以省略,第二个that不可以省略;
6当宾语从句中的主语是this,that或this,that做主语的定语时;
7当宾语从句是双宾语中的直接宾语时;
8当宾语从句的主语是非谓语动词或主语从句时;
9当主语中的谓语动词是固定词组时;
10当宾语从句有it做其先行词时;
11在直接引语中,转述分句把宾语从句隔开时.