that，英文单词，可用作形容词、代词、连词、副词，还可用于固定搭配。作代词时意为“那， 那个；那，那种；（非正式）就那样”，作形容词时意为“那样的”，作限定词意为“ 那，那个；那种”，作连接词副词意为“那样，那么；（非正式）很，非常”，作名词意为“（越）塔特（人名）”。

1.That's my English teacher. 那是我的英文老师。

2.(已被提到的)Who told her that? 那是谁告诉她那件事的?

3(用作关系代词的先行词)What is that which you have just stuffed into the plastic cup? 你刚才塞在塑料杯里的是什么东西?.

4.(代替句中名词,避免重复)The output of steel this year has increased by 20% compared with that in 1992. 今年钢产量比一九九二年增长了百分之二十。

That book isn't mine. 那本书不是我的。

Is the problem that easy? 问题有那么简单吗?

1.(引导名词性从句)

He expressed the hope that we would keep in touch with his firm.他表示希望我们与他的公司保持联系。

My idea is that we should act on his suggestion.

我的意见是我们应当按照他的建议去办。

That she is still alive is a relief.

她还活着,这是令人感到宽慰的。

2.(引导状语从句,表示原因或理由)因为,由于　　We are glad that we have accomplished another arduous task. 我们都感到高兴因为又完成了一项艰巨的任务。

3.(引导状语从句,表示目的或结果)为了,以至于　　He is working hard that he can catch up with the class. 他努力用功,以便赶上班上同学。

4.(引导表示愿望,感叹的从句,主句常省略)　　That I could stay at home today! 今天要是我能呆在家里多好呀!

That is also a determiner. 那

（后接复数名词时用those）。

它用来指已被提到的人或物；也可表对比，指两个中较远的那个。

What about that book you borrowed from me last month？

请注意，that 有时候在句子中具有喜欢或轻蔑等感情色彩。

that little son of his 他那个小宝贝儿子

That George！乔治那家伙！（含有轻蔑语气）

1.that 用作指示代词（复数形式是those），其指代意义同形容词用法，同时它还可以用作定语从句中的先行词；还可为了避免重复，代替前述名词。

That is what he told me.

What is that (which) you have got in your hand?

The price of rice is higher than that of flour.

2.that 用作关系代词，引导限制性定语从句。先行词可人可物，用法相当于who或which。（但是在下列情况下多用that：先行词既有人又有物时；先行词有形容词最高级、序数词、不定代词、very，only等修饰时；先行词是不定代词时）

He talked about the teachers and schools that he had visited.

I think it one of the most wonderful films that the film company has ever produced.

She has little information that is useful for our research.

Is there anything that I can do for you?

请注意，that 在定语从句中作宾语时通常可省略。

The books (that) I sent you will help you in your studies.

引导名词性从句,状语从句和强调句。

①引导宾语从句。及物动词后的引导词that可省略。

② 引导主语从句。通常采用it作形式主语的句型。

③引导表语从句。　The trouble is that we are short of money.

④引导同位语从句。引导同位语从句的that和引导定语从句的that是不同的。前者只起语法作用，在从句中不作任何成分；而后者在定语从句中作主语、宾语或表语。举例说明：　　The news that he resigned from office surprised us.

The idea that he holds is very common nowadays on campus.

that引导状语从句

①引导目的状语从句。

Bring it nearer that I may see it better.

②引导结果状语从句。

What have I done that he should be so angry with me?

③引导原因状语从句。

I am afraid that I will fail in the driving test.

④引导让步状语从句。意为“虽然、尽管”。

Difficult that/as the task was, they managed to accomplish it on time.

⑤引导条件状语从句。意为“假使、假设”。

Supposing that you were in my position, what would you do?

On condition that you were lost in the desert, you should ask for help as soon as possible.

引导强调句。

It is Mrs. White that makes the decision in her family, not her meek little husband.

It is an ill wind that blows nobody good.

1.that用作普通副词。

I was that/so angry I could have hit him.

2.that用作关系副词。引导定语从句，可以代替when，where， why或 in which，常可省略。

I will never forget the evening (that) / when we went to the theatre.　　The house (that)/where I used to live has been knocked down.

in that，意为“既然、因为”。

Criticism and self-criticism is necessary in that it helps us correct our mistakes.

now that，意为“既然、由于”。

Now that they have taken matters into their hands, the pace of events has quickened.

see (to it) that，意为“注意、务必做到、保证”。

We will see to it that she gets home early.

See to it that you are not late again.

seeing that，意为“鉴于、由于”。

Seeing that it is 8 o'clock, we'll wait no longer.

Seeing that he was busy with his work, I didn't disturb him.

You use and all that or and that to refer generally to everything else which is associated with what you have just mentioned. 诸如此类 [非正式]

You use that is or that is to say to indicate that you are about to express the same idea more clearly or precisely. 也就是说

You use that's that to say there is nothing more you can do or say about a particular matter. 就那样好了 [口语]