that都可以引导什么从句？1用作关系代词，引导定语从句
例句：
The only thing that I can do is to have a rest .
我唯一能做的事就是休息。
2用作关联词，引导名词性从句
例句：
That the earth turns around the sun is known to all.
地球围着太阳转这一点是众所周知的。（引导主语从句）
It so happens that I know the man.
碰巧我认识那人。（主语从句）
I will see to it that everything is ready.
我会注意把一切准备妥当的。(宾语从句)
The trouble is that we are short of money.
困难就在于我们缺钱。（表语从句）
There is no doubt that he is the best choice for this position.
无疑，他是这一职位的最佳人选。（同位语从句）
3构成短语，引导状语从句
例句：
Bring it nearer so that I may see it better .
拿近一点，好让我看清楚些。 ( so that 引导目的状语从句)
She got up early , so that she caught the early bus.
她起的早，所以赶上了早班车。( so that 引导结果状语从句)
In order that everybody should hear him , he spoke loudly.
他大声说话，为了使大家都能听得见。（in order that引导目的状语从句）
Nowt hat they have taken matters into their hands the pace of events has quickened.
他们既然已着手自己来处理问题，事态的进展也就加快了。（now that 引导原因状语从句）
什么情况不能用that？关系代词that的用法：
首先特别注意，that只能用在限定性定语从句中，在非限定性定语从句中永远不能选用that, 另外介词后边也不可用that, 而是跟which.在限定性定语从句中，which和that在代替物的时候，一般可以通用。
例句：
The money that (which) is in the wallet ismine.
有些情况下，只宜用that,而不宜用which：
i. 先行词是最高级形容词或者它前面有最高级形容词的时候
例句：
English is the most difficult subject that you will learn during these years.
ii. 先行词是序数词，或者它前面有一个序数词的时候
例句：
He is the last person (that) I want to see.
It is the first American movie of this kind that I’ve ever seen.
iii. 主句已有疑问词who或者which的时候
例句：
Which is the bike that you lost?
iv. 先行词既有人又有物，宜用that
例句：
Do you know the things and persons that they are talking about?
The bike and its rider that had run over an old man were taken to the police
station.
v. 先行词是all, much, little, something, everything,anything, nothing, none, the one等不定代词时
例句：
You should hand in all that you have.
We haven’t got much that we can offer you.
I mean the one that you talked about just now.
vi. 先行词前面Only, any, few, little, no, all, one of, thesame, the very 等词修饰的时候
例句：
The only thing that we can do is to give yousome money.
Li Ming is the only one that wants to be a teacher.
Li Ming is one of the students that want to be teachers in our class.
vii. 有两个定语从句，其中一个关系代词已用which, 另外一个宜用that.
例句：
Edison built up a factory which produced things that had never been seen before.
that
关系代词who和that的选择 关系代词who和that都可以指人，有时使用场合有区别。
（一）关系代词who的使用场合
1．who可以代表人、人格化了的动物、神话故事中的人物或有生命的事物。
如：
1）The dog who is barking is our pet．
2）Those who want to go please sign their names here．
2．在从句中，作主语倾向于用who。
如：
1）The girl who dances beautifully gave us a performance that day．
2）Do you know the comrade who spoke just now？
3．当先行词泛指代词he，they或指示代词those等时，常用who。
如：
1）He who does no work gets no pay．
2）We are badly in need of those who can work in real earnest．
4．先行词前出现不定冠词时，多用 who。
如： 1）I have found a man who can do this work．
2）He is a man who should learn from others．
5．在there be句型中，既作主语又表示人时多用who，或省略。
如：
1）There is someone outside the office who wants to seeyou．
2）There's a m an who lives in that village．
6．不定代词one，ones，anyone等作先行词时，多用who。
如： One who works without complain is welcome here．
7．定语从句和先行词分隔，用that可能引起歧义时，应用who。
如： I saw a man in the street who was surrounded by many people． 这个句子如用that，就可能被人认为是定语从句修饰street。
8．在非限制性定语从句中，一般要用 who，不用that。
如： The soldiers，who may have felt sorry for the boy，had him stand with his back to his father．
9．有两个定语从句出现在一个句子中，第一个关系代词用that的话，第二个就用 who。
如： The man that I like is the one who is both competent and diligent．
但在平行结构中，应根据平行结构的原则重复同一个关系代词。
如： I met a Greek who travelled a lot in the world，but who knew very little about his own country．
注意：关系代词前如有介词或在非限制性定语从句中作宾语，关系代词要用 whom。
如：
1）In the dark street，there wasn't a single person to whom she could turn for help．
2）The brave man，whom the tiger was shot by，is a good hunter．
（二）关系代词that的使用场合
1．在以疑问词who开始的句子中，避免两个who重复，用that。
如： Who is the man that is shouting there？
2．关系代词在从句中作表语时，多用 that。
如： She is not the girl that she was three years ago．
3．先行词被形容词最高级、only等修饰时，应用that。
如： Tang Guoqiang has become one of the best actors that appear on Chinese screens．
4．先行词人和物两者都有时，要用that。
如： He talked about the teachers and schools that he had visited．
5．关系代词与the same（指同一人）连用时，只能用that。
如： This is the same person that I met yesterday．
6．一个句子中有两个定语从句时，如第一个从句中已用who，第二个从句中宜用that。
如： The man who is at table is his brother that has been serving in the army．
关系代词that和which的选择关系代词that和which都可以指物，在很多场合两者都通用。但有时that和which的使用场合并不相同。
（一）关系代词which的使用场合
1．如果先行词是that，关系代词应用 which。
如： What was that which you said about him ？
2．先行词和定语从句之间被其它较长的成分分隔，用which较好。
如： I have some interests outside my professional work which gives me great pleasure．
3．一个句子中如有两个定语从句，第一个定语从句用了关系代词that，第二个从句宜用which。
如： This is the book that you bought which you have lost． 但在平行结构中，应重复同一个关系代词。
如： I have a house which is located on the hill side，which faces the south．
4．非限制性定语从句中关系代词一般要用which。
如： I will buy a book，which tells about the use of English idioms．
5．相当于并列句和状语从句的定语从句，用which引导。
如：
1）We went to the nearest port which we reached safely．
2）He persisted in having a bicycle which he actually had no use for．
6．关系代词前如有介词，关系代词要用 which。
如： They had a meeting at which he spoke on the current economic situation．
如把介词移至句末，可用that（或省略）。
如： This is the book（that）she was looking for．
（二）关系代词that的使用场合
1．一般说来，先行词是all，anything，everything，nothing，much，little，few等，关系代词应用that。
如：
1）That's all（that）I know．
2）Everything that can be done is done．
2．先行词之前有all，any，every，no，little，much，only，very等修饰时，关系代词应用that。
如：
1）He'll read all the books that are sold here．
2）Ask any questions（that）you don't understand．
3．先行词前有序数词或形容词最高级修饰时，关系代词应用that。
如：
1）This is the most wonderful film that I have ever seen．
2）The first thing that you should do is to work out aplan．
4．当先行词是to be的表语，或关系代词本身是从句的表语时，关系代词应用that。
如：
1）It's a song that is very popular．
2）My hometown is no longer the place that it used to be．
5．当主句以There be开头时，关系代词应用that。
如： There is a seat in the corner that is still free．
6．当一个句子中含有两个定语从句时，如前一个已用关系代词which，后一个关系代词宜用that。
如： I'll borrow a book which tells about the heroic deeds that the PLA did in thebattles against the invaders． 但两个定语从句的结构如果平行，一个定语从句中用关系代词that，另一个定语从句也应重复that。
如： He told me to read a book that is very short，and thatis very interesting．
7．与the same（指同一物）连用，构成the same．．．that．．．结构时，关系代词只能用that。
如： This is the same museum that you once visited． 注意：the same．．．that．．．结构中的that不能用as代替，因为thesame．．．as．．．与the same．．．that．．．的含义不同。
that可引导名词性从句，包括主语从句、宾语从句、表语从句，在句中作从属连词，不引导状语从句，但in order that,so that可引导状语从句。
此句中，that作为同位语从句引导词来解释conclusion，与定语从句中的that相鉴别，定语从句中的that可以省略，而同位语中的that不可以。
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