1. 作主语：That he should say so surprised us all.
2. 作宾语：We still remember that he said so.
3. 作表语：The fact is that he had left before I came.
4. 作定语：The question that he asked surprised everyone.
5. 作状语：He always spoke as if that was the only way.
6. 作同位语：The news that he won the award made us all so happy.
7. 作介语：We are very sure that he will come tomorrow.
1.that用作指示代词的意思是“那,那个”。可指前面提到的那件事,也可指在空间或时间上较另一事物远的事物或人,还可指要表明的或要提及的事物、想法等。
2.that用作关系代词时,指人或事物,同时又在从句中充当句子成分。that偶尔也可引导非限制性定语从句。
3.that还常用以代替who, whom, which,但that...which中的that用做关系代词的先行词。
4.that用作关系代词时在下列情况下可以省略:①引导限制性定语从句在从句中用作宾语时; ②用在there be结构前作主语时; ③用作表语时; ④在定语从句与先行词之间有插入语时; ⑤在先行词way, reason, distance, place, office等作方式状语、原因状语或地点状语时。
5.that用作连词时可引导主语从句、宾语从句、表语从句、同位语从句和状语从句。
6.that还常引导间接引语或形容词后面的从句。
7.that在以it作形式主语的句子中或引导宾语从句、状语从句时常可省略。
8.that也可用于表示愿望或遗憾。
一、引导名词性从句
即引导主语从句、宾语从句、表语从句和同位语从句，that没有任何意义，也不作任何句子成分，只起引导作用。
1. 引导主语从句
由于中英语言文化的差异，汉语没有主语从句。如，“英语很重要不是人人都认同的。”汉语语法认为，“英语很重要”是主位词组做句子的主语。而英语句子“That English is of vital importance is not acknowledged by all.”中，That English is of vital importance是主语从句。虽然that没有任何意义，也不作任何句子成分，只起引导作用，但是却不能省略。如：
That English teacher can speak fluent English is a fundamental requirement.
2. 引导宾语从句
引导宾语从句的that一般可以省略，但在以下六种情况下，一般不能省略。
（1）两个以上的宾语从句并列时，从第二个从句开始，that 不能省略。如：
Jack was informed（that）he had been enrolled in Sun Yat-sen University，and that he should register by August.
（2）介词后引导宾语从句的that 不能省略。如：
His parents expected him nothing but/except that he can make a living by himself after graduation.
（3）主句的谓语动词与that引导的宾语从句之间有插入语时，that不可省略。如：
The head teacher told Jack， after a short hesitation， that he could have a day off on condition that he could make up for the missing lessons.
（4）形容词后引导宾语从句的that一般不省略。如：
Marys parents are very content that their daughter has made such great progress in the final examination.
（5）在 it（形式宾语）+ adj.（补足语）+ that（宾语从句）结构中， that不能省略。如：
Everyone believes it strange that he could pass the driving test.
（6）在直接引语中，that引导的宾语从句与主句隔开时，that不能省略。如：
“Im sorry to say，” he said， “that you are not the suitable person for the work.”
3. 引導表语从句
表语从句位于连系动词后，引导表语从句的that一般不能省略。如：
My advice is that everyone be punctual for the appointment.
特别注意：下列句式中的that一般不能用because代替。
The reason why he was late for school is that he missed the early bus.
4. 引导同位从句
同位语从句就是在news， information， fact， word， idea等抽象名词之后，说明其具体内容的从句。引导同位语从句的that一般不能省略。如：
Based on the fact that you are enthusiastic about Chinese culture， Im writing to invite you to get involved in it.
二、引导定语从句
that常被用来代替关系代词which或who，引导定语从句。以下几种情况，多用that而不用which或who。
1. 当先行词是表示事物的all， any， anything， everything， nothing或被all， any， every等修饰时。如：
Do you have anything that you are puzzled with？
All that can be done must be done.
2. 当先行词被形容词的最高级或序数词修饰时。如：
It is one of the most touching movies that have been shown this month.
The first thing that we should do is to get some food.
3. 当先行词有the only， the very， the same， the last 等修饰时。如：
The only thing that is impressive is his unforgettable experience in Beijing.
4. 当主句以who或which开头的疑问句时。如：
Who is the girl that is delivering a speech over there？
5. 当先行词既有人又有物时。如：
The writer and his novel that you have just talked about are really well known.
三、引导状语从句
1. that 可引导目的状语从句和结果状语从句，that一般不省略。如：
The story is so touching that we will bear in our mind for a long period.
An English Speech Contest will be organized so that/ in order that students can improve their oral English.
四、用作替代词
My seat is next to that of Marys.
The temperature in Guangdong is higher than that in Beijing.
五、用作副词
Thanks for your encouragement， but actually my handwriting isnt that beautiful.
六、 用在强调句型中
It was what you said that sparked his motivation to work hard.
七、用在一些成语中
1. like that 像这样
Do you usually speak to your parents like that？
2. Thats it. 说对了。
Thats it. Youve described exactly what I felt about the film.
3. Thatthat. 情況就是如此。
Well， the only task for you is to clean the blackboard in time， and thats that.
4. with that接着，然后
He said goodbye to me and with that he left.
一、that 用作形容词（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？
that little son of his他那个小宝贝儿子
That George！---->含有轻蔑语气
乔治那家伙！
二、that 用作代词
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 filmsthat 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.
三、that 用作连词，引导名词性从句，状语从句和强调句。
1、that 名词性从句
A、引导宾语从句，及物动词后的引导词 that 可省略。
I didn't expect (that) he could win the championship.
The teacher pointed out that Tom was notworking hard enough.
B、引导主语从句。通常采用 it 作形式主语的句型。
That the earth goes around the sun is known to everyone. = It is known to everyone that the earth goes around the sun.
C、引导表语从句
The trouble is that we are short of money.
D、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.
2、that引导状语从句
A、引导目的状语从句
Bring it nearer that I may see it better.
B、引导结果状语从句
What have I done that he should be so angry with me?
C、引导原因状语从句
I am afraid that I will fail in the driving test.
D、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 ontime.
E、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 thedesert, you should ask for help as soon as possible.
3、引导强调句
It is Mrs. White that makes the decision in her family, not her meek littlehusband.
It is an ill wind that blowsnobody good.
四、that用作副词
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 hasbeen knocked down.
五、与that 有关的常见重要短语
1、in that，意为“既然、因为”
Criticism and self-criticism is necessary in that it helps us correctour mistakes.
2、now that，意为“既然、由于”
Now that they have taken matters into their hands, the pace of events has quickened.
3、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.
4、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.
六、必须用 that 的情况
1、在there + be 的句型中，句子的主语是先行词，而且又是物。例如：
There are two novels that I want to read.
我要读的有两本小说。
There is no work that can be done now.
没有什么工作现在能做的了。
2、当先行词为主句的表语或者关系代词为从句的表语时。例如：
This is the book that was bought yesterday.
这就是昨天买的书。
Our school is no longer the school that it used to be.
我们的学校不再是以前的学校了。
That’s a good book that will help you a lot.
3、以Here is (are)开头的句子时。例如：
Here are two books that I will buy.
这是我要买的两本书。
Here is a film that will move anyone.
这是一部将使任何人受感动的电影。
4、It is (high)time +定语从句中。例如：
It is time that we should have a rest.
我们应该休息了。
It is high time that they started out.
他们该动身了。
5、当先行词是 way 等词时，关系代词用 that 或者 in which 在定语从句中作方式状语时，在口语中，常可省略。例如：
This is the way that my fatherdid this work.
这就是我父亲做此工作的方式。
She admired the way in which I answered the questions.
她羡慕我回答问题的方式。
6、在双重限定性定语从句中，如果一个从句用 who 或者 which 引导时，那么另一个从句用 that 引导。例如：
He is the student that I have ever see who can jump highest.
他是我曾经看到过跳得最高的学生。
My brother studies in the school which is the most beautiful in our citythat isn’t far from here.
我的弟弟在我们的城市最美丽的学校读书，并且离这儿不远。
7、当先行词被 the only, the very, the same, the last 修饰时。例如：
This is the very pen that I am looking for.
这正是我找的钢笔。
The only book I want to read is missing.
我唯一想看的书不见了。
There’s little time that we canspare. That is the very dictionary that I want to buy.
8、在强调句子中，并且以 who ,which, what 开头时。例如：
Who was it that was lost ? ---->此句中，最好不用who来代替that，避免重复。
究竟是谁迷路了？
What was it that you did last week?
你上周究竟做什么了？
9、当先行词被形容词的最高级或序数词修饰时。例如：
You are the first person that I want to ask for.
你是我要见的第一个人。
This is the second book that I have ever written.
这是我写的第二本书。
This is the most interesting filmthat I have ever seen
10、当先行词被no, all,