Question

宾语从句什么时候用that

Answer 1

可接that引导宾语从句的动词：

say, think, insist, wish, hope, demand, imagine, wonder, know, suppose, see, believe, agree, admit, deny, expect, explain, order, command, feel, dream, suggest, hear, mean, notice, prefer, request, require, propose, declare, report等。

eg. The girl feels that the atmosphere is terrible.

that在非正式场合可以省略，但在以下几种下不能省略：

1.当句中的动词后接多于两个由that引导的宾语从句时，第一个that可省，但后面的that不可省。

eg. He said (that) you were too young to understand the matter and that he was asked not to tell you.

2.当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。

eg. Just then I noticed, for the first time, that our master was wearing his fine green coat and his black silk cap.

Answer 2

宾语从句用that其实就是把陈述句变成宾语从句的时候用that引导。这时候that也可以省去，必须是做宾语的时候that可以省去。宾语从句，你记住。
陈述句变宾语从句用that。如果是一般疑问句，变宾语从句要用if或者是whether ，如果是特殊疑问句，就用他原来的疑问词引导就可以了。

Answer 3

1.主从句之间有插入语的时候（两个逗号当中）
2.从句主语是that时不能被省略
列举Ithink that is the point
3.出现两个或两个以上的从句，只有第一个从句that可省略（主句动词后面），第二个从句不能省略（没更在主句动词后面）

Answer 4

句子成分完整时

如
He says he is from China.