宾语从句可以分为三类

( 1).动词的宾语从句

1.1大多数位于动词后面

Eg： I hope you can join us in the game.

1.2有些是“动词+副词”后

Find out/ point out/ figure out/ turn out/ figure out

Eg： Can you figure out what the poet really means in this poem?

1.3有些动词短语后面

Make sure/ make up one’s mind/ keep in mind

Eg; we should keep in mind that sports can be a great boost to our health.

( 2) it作形式宾语代替宾语从句

第一类动词; find/ feel/ think/ consider/ make/ believe/ guess/ suppose/ assume等后面有宾语不足语时，需要用 it作形式宾语而将 that引导的真正的宾语从句后置。

Eg： I think it necessary that we do some sporting.

第二类动词带宾语从句时需要在从句前面加 it。

这类词： hate/ like/ dislike/ appreciate/ depend on/ see to/

Eg: I hate it when they talk without considering other’s feeling.

但是如果宾语从句是 WH -类引导的，其后面有 to be短语作宾语补足语，不可以用 it代替。

We all consider what you said to be unbelievable. (right)

We all consider it to be unbelievable what you said. (wrong)

( 3)形容词后的宾语从句

Adj: sure/ certain/ glad/ pleased/ happy/ afraid/ sorry等等。

Eg; I am not sure whether you will come or not.