宾语从句其实就是把一个从句（一个功能齐全的简单句或复合句）嵌入一个简单句里。例如：

I declare thatmy work is original.我宣布我的作品是原创的。

主句： I declare that 我宣布了一件事。

从句：My work is original 我的作品是原创的。

从句修饰主句：我宣布我的作品是原创的。

例句就是把一个主系表结构的从句嵌入主谓宾结构的简单句里。

可以充当宾语的从句类型

陈述句

一般疑问句（从句中必须是陈述句语序，非疑问句）

I wonderwhether/if Jim is at home.

I wonderwhether tomorrow is a good time to visit her.

特殊疑问句（从句中必须是陈述句语序，非疑问句）

He didnt tell me when we shall meet again.

She always thinks of how she improve her work.

She will give whoever needs help a warm support.

Can you tell me who the beauty is?

三种基本类型

动宾从句

有些动词可直接连接宾语从句，如 believe，admit，consider，dream，promise, declare 等, 基本所有及物动词都能这么用

I declare that my work is original.

I do not admit that I have cheated.

They informed me that I have been promoted.

I promise you that I will finish this work within a month.

I promise that I will never break my words.

用it做形式宾语, find, feel, consider, make, believe, think等后面有宾语补足语的时候

I think it necessary that we take measures to reduced green house emission.

I have make it clear that you are not welcomed here.

We take it that you will agree with us.

介宾从句

很多动词和介词搭配使用，如 depends on, surprised at

Whether you can succeed depends on how hard you try.

He was not conscious of what a big mistake he had made.

I am surprised at what you said.

介词宾语一般不跟that，只有在固定搭配时例外，如in that，except that, but that, save that等

He is different from others in that he is brave.

I know nothing about him except that he killed the dragon.

Your outlook is perfect except that your shoes are dirty.

形宾从句

形容词有动词的意思, sure, certain, glad, please, happy, sorry, afraid, satisfied, surprised

I am sorry I am late

I am not sure this is your true intention.

We are glad you are one of us now.

几种特殊规则

用whether或if引导的宾语从句

Whether this is true or not, I really dont know.

Whether you like me or not, I really dont care.

不能省略引导词that的状况

从句是直接宾语

She told me that the match has been concealed.

I cant let him know that his mother is ill

多个that引导的从句，后面的that不可省略

Mama said (that) you are an angel and that she will not allow anyone to hurt you.

We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the pursuit of Happiness. 我们认为这些真理是不言而喻的：人人生而平等，造物者赋予他们若干不可剥夺的权利，其中包括生命权、自由权和追求幸福的权利。——经典例句，来自独立宣言。

谓语和that之间有插入语

I noticed, for the first time, that she was not the girl I want.

it 做形式宾语时

I think it necessary that we hold a meeting to solve this problem.

That前置的强调句

That he is stupid is known to everyone.

否定转移

主句的谓语动词是think,believe,imagine,suppose,consider,expect,fancy,guess时，从句的否定词转到主句

I dont think (that) you are right.

I dont know (that) you are coming. otherwise I would have picked you up at this airport.

主从句时态关系

主句为一般现在时或一般将来时，从句时态不受主句影响

主句为过去时

表示同时主从句动作同时发生：从句用一般过去时，过去进行时 She said she was playing video games.

动作发生在主句动作之前：从句用过去完成时 He didnt know what they had come here for.

动作发生在主句动作之后：过去将来时 He told me he would spend his holidays with his girl friend.

如果从句是客观真理，它不受主句时态的影响

I knew that the earth goes around the sun.