that都可以引导什么从句？ 请举例说明 最好有例句 谢谢
答：1、用作关系代词，引导定语从句
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
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
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. earnest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）
Now that 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）
That从句。什么情况不能用that？
这种情况多见于定语从句，现将重点提供如下：
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。
The money that (which) is in the wallet is mine.
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
This is the best that has been used against pollution.
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
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
Which is the bike that you lost?
iv. 先行词既有人又有物，宜用that
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
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, the same, the very 等词修饰的时候
The only thing that we can do is to give you some 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.
Edison built up a factory which produced things that had never been seen before.
that
一、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 m an who can do this work．
2）He is a m an 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 see you．
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：

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