宾语从句是名词性从句的一种，用来充作宾语的句子叫做宾语从句。如：He asked what you were doing last night. 他问你昨天夜晚在干什么。
在宾语从句中须注意：
1. that 在口语中常被省略，但在正式的文体中，不能省；并且它一般不能引导介词的宾语从句，但可引导except, but, in 等少数介词的宾语从句。如：
I didn’t know (that) he was Li Lei. 我不知道他就是李蕾。
I will do anything I can to help you except that I’m ill. 只要我身体舒服，我愿做任何事情来帮助你。
2. 宾语从句之后带有补足语成分时，一般须用it作形式宾语，把宾语从句放到句末，此时的that不能省。如：
The boy has made it clear that they can’t play with his toys. 那个男孩已清楚的表明他们不能玩弄他的玩具。
3. 动词advise, ask, demand, desire, insist(坚决主张), order, propose, request, suggest(建议)等代的宾语从句须用虚拟语气，即：(should) do的形式。
He asked that we (should) get there before nine o’clock. 他要求我们在九点钟之前赶到那儿。
The teacher advised us that we (should) not waste our time. 老师劝告我们不要浪费时间了。
4. 宾语从句的时态与主句的时态须呼应。即：
1)当主句谓语动词的时态是现在时或将来时，从句的谓语动词可用任何所需要的时态表示。如：
He always says that he is our good friend. 他总是说他是我们的好朋友。
When the teacher knows what we have done, he will say that we have done a good deed. 当老师知道我们所干的事情时，他会说我们做了一件好事。
2)当主句谓语动词的时态为过去时，从句的谓语动词须用响应的过去时。如：
He didn’t tell us he came from Shanghai. 他没有告诉我们他来自上海。
He said he had read the book. 他说他读过这本书。
3)但当从句的内容是客观真理或客观事实，而不受时间的限制时，即使主句谓语动词为过去时，从句仍用一般现在时。如：
Chairman Mao said that all the imperialists are paper tigers. 毛主席说一切帝国主义者都是纸老虎。
When we were children, we were told that China is in the east of the world. 我们还是小孩子的时候，人们就告诉我们说中国在世界的东方。
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.
3. 宾语从句的语序问题
（1）要把疑问语气改为陈述语气
Eg：I could not understand why you refused this good opportunity.
(2) 宾语从句引导词that 的省略问题
That在一般情况下可以省略，但在一下情况下不可以省略。
a.一个动词带有两个或多个并列的宾语从句，第一个that可以省略，第二个和以后的都不可以省略。
Eg：Our parents tell us that we should be honest and that we need learn how to share our feelings with others and that we must know how to learn from others.
b.宾语从句是双宾语中的直接引语
Eg：lily told me that she would not come to school tomorrow.
c.有it 作形式宾语
Eg：we all consider it important that children need enough sleep.
(3)宾语从句的否定转移
条件：1 主语是第一人称
2 谓语动词是think/ believe / suppose/ imagine/ guess / expect
意义：“主句否定形式，从句否定意义”
Eg: I don’t believe that you are a good guy.
(4)宾语从句的时态
宾语从句的谓语动词时态通常受到主句时态的影响
1.（主现，从不变）主句为一般现在时态，宾语从句根据需要选择时态。
Eg：I know that you did not finish your homework yesterday.
2.（主过，从过）主句为一般过去时态，宾语从句选择与过去有关的时态。
Eg：he told me that he had been to America .
3.(主过，从真理现)主句为一般过去时态，宾语从句如果是客观事实和永久不变的真理，用一般现在时态。
Eg：My mother once told me that the sun rises in the east and sets in the west.
(5)运用虚拟语气的情况
建议 suggest 、advise、propose；
要求demand 、desire、request；
决定 decide；
命令 order、command、require；
坚决主张 insist；
等动词后跟宾语从句，用（should）+v.（虚拟语气）