【导语】下面是小编为大家整理的let的用法总结简单（共16篇），供大家参考借鉴，希望可以帮助到有需要的朋友。
接动词不定式作宾语补足语时,如用于被动结构，to须保留。let还可接不带to的动词不定式作宾语,这时主要用于某些固定搭配中。
let用作不及物动词时主要表示“出租”,主语通常为物(如房子等),其主动形式含有被动意义。
语法 | let用法
今天，给大家讲一讲let的用法!
基本含义
let的基本意思，是允许对方照其意思而行。引申可表示“出租”“放掉,松掉”等。用于数学中通常表示“假设”。
具体用法
表示让，允许的用法。
例句：No visitors are let into the committee meetings.委员会会议不允许任何访问者闯入。
Let me have a look at this watch.把这只表让我看看。
Let's consider briefly his suggestion.让我们考虑一下他的建议。
let用作名词有阻碍，擦网球，球触网重发，出租的含义。
例句：I can't get a let for my house.我的房子租不出去。
Please allow the bearer of this passport to pass freely without let or hindrance.请予护照持有人顺利通行。
If you hit a let,you can serve again.如果发了擦网球，可以再发一次。
“let us”和“let's”居然不是一个意思!这么多年英语都白学了!
Let us & let's
let's是用于提出建议，表达说话人和说话的对象一起做某事。
Let's?begin?our?discussion,shall?we???我们开始讨论,好吗?
Let's?start?early,shall?we??我们早点动身,好吗?
let us 中的 let 相当于 allow，请求说话对象准许你和其他人去做某件事，这个 us 是不包括说话对象的。通俗点形容就是你请求你爸爸同意你跟对象一起出去玩。
Listen, if you talk to him or anything make sure you let us know, will you 听着，如果你和他说话或什么的，一定要让我们知道，好吗?
If you have had a problem with the vatman, let us know. 如果您对增值税有什么异议的话，请告诉我们。
当然啦，也有特殊情况，当你要和对象做些什么事情的时候，也可以通用。
Let's get married.我们结婚吧!
表达请求的句子
Would?you?like?/?love?(to?do)?sth.??
这是一个很委婉的表示建议的句型,并带有与对方商量的意味,意为你想要(做)......吗?
—Would?you?like?to?go?to?the?cinema?with?me??—Yes.?I'd?like?/?love?to.
Shall?I?/?we?do?sth.?
此句型是用来提建议或征求对方意见的,意为我(们)做......好吗?语气委婉,商量的语气较浓。
Shall we go for a walk?我们去散步好吗?
主语+had ?better?(not)?do?sth.
该句型用于表示对下级、晚辈的劝告,往往带有命令、强制的语气,意为某人最好(不要)做某事。
You had better repair your shoes one time.
你最好把你的鞋修理一下。
You had better affirm repeatedly when beginning to optimize.
你最好在开始优化的时候再三确认。
使役动词let的用法
let的用法
1)let +宾语+do(省to不定式)：表示主语“要”“使”“让”宾语干某事，宾语和宾补之间是一种主动关系。
Let them stay in the classroom and do their exercises themselves.让他们自己待在教室里做练习吧。
Let AB be equal to CD.假设AB等于CD.
2)let+宾语+副词/介词短语作宾补
Let me in and let them out.让我进来，让他们出去。
Who let you into the building?谁让你进到大楼里来的?
老外说 “let's roll” 是什么意思?让我们滚吧?
今天助理毛毛和外教Peter去拍摄
到场地，peter喊了一句 Let's roll!
roll不是滚吗?让我们滚?毛毛这一头问号啊
roll这个词，你要只知道“翻滚”，可就亏大了!
今天的话题
roll那些不能不知道的用法
let's roll是什么意思?
口语中
Let's roll 可以理解成
咱们干吧!冲吧!上吧!
它比 let's go 或者 let's start更有决心
在面对困难或者背水一战时
let's roll 这句话很能振奋人心
Time to fight，let's roll!
战斗时刻，冲啊上啊!
Roll 还可以理解成【走，离开】
相当于leave
Time to roll. 该走了.
Ready to roll? 准备走了?
A：6 o'clock, time to roll !
6点啦，该走了!
B：Yeah. Let's roll.
是啊，一起走吧。
roll on能表达期盼
可以直接说
(英式用法)
↓比如期盼假期↓
I can't wait to go on vacation - roll on October!
我等不及要度假—10月份快点到啊!
↓期盼周末↓
I hate Monday，roll on Friday!
我讨厌周一，周五快来吧!
roll up 暗示迟到
对于经常踩点到、迟到一两分钟的人
说late他们肯定不服气的
歪果仁会用 roll up 暗搓搓表达
姗姗来迟
Max rolled up drunk just after 9 o'clock.
9点刚过，Max醉醺醺的姗姗来迟。
call roll 表达 点名
这里，roll是名词，意思是“花名册”
call the roll 就是点名
Three students slept late and missed roll call.
有3个学生起晚了，点名没到。
用法：leave out侧重强调“遗漏”，与miss out的区别：miss out侧重指“错过”。
例句：The translation of the third paragraph of the article was left out.
结构分析：The translation of the third paragraph of the article是主语(of the third paragraph of the article是后置定语)，was left out是谓语(过去时，被动时态)。
用法：let down如果后接宾语是人称代词，必须为宾格形式;也可以表示“放低，放下”。let down经常用于let sb down结构中。
例句：She promised her parents that she would not let them down before she left.
她在离开前向父母保证不会让他们失望。
用法：let in也可以表示“(水)渗入，漏入”，常用作let sb/sth in。
例句：Although it’s a bit cold, you should open the window and let the fresh air in the room.
尽管有点冷，你也应该把窗户打开，让新鲜空气进入房间。
用法：let out作“放出”解时，与give away同义;也可以表示“解雇，出租，学校放学，剧院散场，训练结束”。
例句：Carbon dioxide let out by automobile exhaust has a great influence on people’s life.
汽车尾气排放的二氧化碳对人们的生活造成了很大影响。
0118作业动词短语：light up照亮
用法：light up也可以表示“容光焕发，面露喜色”;其后一般接表示物的名词。
例句：A candle is not enough to light up the whole room.
let的用法：
1)当let后只有一个单音节动词，变被动语态时，可用不带to的不定式。
They let the strange go.--->The strange was let go.
2)若let后宾补较长时，let通常不用被动语态，而用allow或permit代替。
The nurse let me go to see my classmate in the hospital.
---->I was allowed/permitted to see my classmate in the hospital.
句型：
一、let sb do sth．“让某人做某事”，如：
Let's have a break．让我们休息一下吧。
二、由“let”开头的.祈使句是个常见的动词句型，它的主要用法有下列三种：
表示“建议”。在此句型里的“let”后头紧跟着一个第一人称的代词宾语，如
（1）Let me try.
（2）Let's do it.
（3）Let me go.
此句型语气委婉，比直接的祈使句客气。试比较句子的差别：
（4）a. Don't disturb him.
b. Let's not disturb him.
其中a句是直接命令，语气强烈，而b句带有建议的意味，语气婉转温柔。
1、let的基本意思是允许对方照其意思而行,引申可表示“出租”“放掉,松掉”等。用于数学中通常表示“假设”。
2、let用作及物动词作“出租”解时,可接名词或代词作宾语,也可接双宾语,其间接宾语可以转化为介词to的宾语;作“让,使”解时,通常接以形容词或不带to的动词不定式充当补足语的复合宾语;接动词不定式作宾语补足语时,如用于被动结构, to须保留。let还可接不带to的动词不定式作宾语,这时主要用于某些固定搭配中。
3、let用作不及物动词时主要表示“出租”,主语通常为物(如房子等),其主动形式含有被动意义。
4、用作动词的例句：
No visitors are let into the committee meetings.
委员会会议不允许任何访问者闯入。
Let me have a look at this watch.
把这只表让我看看。
Let's consider briefly his suggestion.
让我们考虑一下他的'建议。
5、let用作名词有阻碍，擦网球，球触网重发，出租的含义。
I can't get a let for my house.
我的房子租不出去。
Please allow the bearer of this passport to pass freely without let or hindrance.
请予护照持有人顺利通行。
If you hit a let,you can serve again.
如果发了擦网球，可以再发一次。
let用作及物动词作“出租”解时,可接名词或代词作宾语,也可接双宾语,其间接宾语可以转化为介词to的宾语;作“让,使”解时,通常接以形容词或不带to的动词不定式充当补足语的复合宾语;接动词不定式作宾语补足语时,如用于被动结构, to须保留。let还可接不带to的`动词不定式作宾语,这时主要用于某些固定搭配中。
例句：
It is important not to let things get out of perspective.
重要的是不要把事情轻重倒置。
Let us approach the subject from a different direction.
咱们从一个不同的角度来探讨这个题目吧。
It is important not to let production levels fall.
重要的是别让产量滑落。
Next time you're here let's have lunch together.
下次你到这里来，咱们一起吃午饭。
Please let me know how many are coming, if any.
请告诉我，如果有人要来的话，有多少？
let 的用法
They let the strange go.--->The strange was let go.
2） 若let 后宾补较长时，let 通常不用被动语态，而用allow或permit 代替。
The nurse let me go to see my classmate in the hospital.
---->I was allowed / permitted to see my classmate in the hospital.
1）当let后只有一个单音节动词，变被动语态时，可用不带to 的不定式。
they let the strange go.--->the strange was let go.
2） 若let 后宾补较长时，let 通常不用被动语态，而用allow或permit 代替。
the nurse let me go to see my classmate in the hospital.
---->i was allowed / permitted to see my classmate in the hospital.
let的用法1：let的基本意思是允许对方照其意思而行,引申可表示“出租”“放掉,松掉”等。用于数学中通常表示“假设”。
let的用法2：let用作及物动词作“出租”解时,可接名词或代词作宾语,也可接双宾语,其间接宾语可以转化为介词to的宾语;作“让,使”解时,通常接以形容词或不带to的动词不定式充当补足语的复合宾语;接动词不定式作宾语补足语时,如用于被动结构, to须保留。let还可接不带to的动词不定式作宾语,这时主要用于某些固定搭配中。
let的用法3：let用作不及物动词时主要表示“出租”,主语通常为物(如房子等),其主动形式含有被动意义。
let的用法4：在口语中, let常用于祈使句中表示建议、请求、命令、警告等;在书面语中,可用allow代替let。
let
重发球; 出租; 触网球; 发球擦网后重发;
let off
宽恕，放过; 开(枪)，放(炮、烟火等)州)放; 排放; 免除;
let alone
更别提,不打扰; 更别提; 不打扰，不惊动，更别提; 不打扰;
let alone
更不用说; 不干涉; 听其自然; 别管，更不用说;
let down
放低; 失信; 出卖; 降低;
allow，let，permit，leave，authorize
这些动词均含“让、允许”之意。
allow 普通用词，侧重听任、默许或不加阻止。在正式场合可用来表客气的请求。
let 常用词，用于各种非正式场合，语气最弱，指允许或无力阻止某事，暗示漠不关心或听之任之。
permit 正式用词，在多数场合可与allow换用，语义最强，指准许某人做某事，含权威或正式的意味。
leave 侧重不加干涉。
authorize 语气最强，指权威性的允许与认可。
1. Well, at any rate, let me thank you for all you did.
好吧，不管怎样，还是要感谢你所做的一切。
2. I let the horse drop his head to crop the spring grass.
我让马低下头啃吃春天的青草。
3. If they value these data, let them pay for them.
他们要是看重这些数据，就让他们出钱买。
4. He's pissed. Let's get out of his way before he starts spewing.
他很恼火。趁他还没有发作，我们赶快离他远点儿。
5. Now let me see, who's the man we want?
现在让我看一看，谁是我们要找的人?
6. “Let's invite her to dinner.” — “Over my dead body!”
“我们请她来吃晚饭吧。”——“除非我死了!”
7. Leave a vent open to let some moist air escape.
打开一个通风口，让潮气逸出一些。
8. Though Sybbis complained bitterly, Mama would not let up on her.
尽管西比斯大发牢骚，但妈妈不会放她一马。
9. He rang for the guard to let him out.
他按铃叫保安放他出去。
10. I let myself out into the street and pulled the door shut.
我出门上街并拉上了门。
11. She unbound her hair and let it flow loose in the wind.
她把头发解开，让它随风飘动。
12. “Let's get a coffee somewhere.”—“I know just the place.”
“我们找个地方喝杯咖啡吧。”——“我知道个好地方。”
13. The Doberman let out a string of roaring barks.
短毛猎犬一阵狂吠。
14. She heard him let out a pitiful, muffled groan.
她听到他发出一声令人悲悯的低沉的呻吟声。
15. She gathered loose soil and let it filter slowly through her fingers.
她捧起疏松的泥土，任其缓缓地从指间漏下。
过去式: let
过去分词: let
现在分词: letting
let的用法1：let的基本意思是允许对方照其意思而行,引申可表示“出租”“放掉,松掉”等。用于数学中通常表示“假设”。
let的用法2：let用作及物动词作“出租”解时,可接名词或代词作宾语,也可接双宾语,其间接宾语可以转化为介词to的宾语;作“让,使”解时,通常接以形容词或不带to的动词不定式充当补足语的复合宾语;接动词不定式作宾语补足语时,如用于被动结构, to须保留。let还可接不带to的动词不定式作宾语,这时主要用于某些固定搭配中。
let的用法3：let用作不及物动词时主要表示“出租”,主语通常为物(如房子等),其主动形式含有被动意义。
let的用法4：在口语中, let常用于祈使句中表示建议、请求、命令、警告等;在书面语中,可用allow代替let。
let的过去式例句
1. Well, at any rate, let me thank you for all you did.
好吧，不管怎样，还是要感谢你所做的一切。
2. I let the horse drop his head to crop the spring grass.
我让马低下头啃吃春天的青草。
3. If they value these data, let them pay for them.
他们要是看重这些数据，就让他们出钱买。
4. He's pissed. Let's get out of his way before he starts spewing.
他很恼火。趁他还没有发作，我们赶快离他远点儿。
5. Now let me see, who's the man we want?
现在让我看一看，谁是我们要找的人?
6. “Let's invite her to dinner.” — “Over my dead body!”
“我们请她来吃晚饭吧。”——“除非我死了!”
7. Leave a vent open to let some moist air escape.
打开一个通风口，让潮气逸出一些。
8. Though Sybbis complained bitterly, Mama would not let up on her.
尽管西比斯大发牢骚，但妈妈不会放她一马。
9. He rang for the guard to let him out.
他按铃叫保安放他出去。
10. I let myself out into the street and pulled the door shut.
我出门上街并拉上了门。
11. She unbound her hair and let it flow loose in the wind.
她把头发解开，让它随风飘动。
12. “Let's get a coffee somewhere.”—“I know just the place.”
“我们找个地方喝杯咖啡吧。”——“我知道个好地方。”
13. The Doberman let out a string of roaring barks.
短毛猎犬一阵狂吠。
14. She heard him let out a pitiful, muffled groan.
她听到他发出一声令人悲悯的低沉的呻吟声。
15. She gathered loose soil and let it filter slowly through her fingers.
她捧起疏松的泥土，任其缓缓地从指间漏下。
1. I'd been a fool letting him snow me with his big ideas.
我真蠢，居然被他的胡乱吹嘘给蒙蔽了。
2. Lazy and incompetent police officers are letting the public down.
懒惰兼无能的警官令公众失望。
3. I'm going to stop letting drugs and drink rule my life.
我决心不再让毒品和酒精控制我的生活。
4. The reasons for letting a house, or part of one, are varied.
把整套房子或其中一部分租出去，其原因是多种多样的。
5. He knows the culprit but is not letting on.
他知道罪犯是谁，但却闭口不说。
6. Most authorities recommend letting the baby nurse whenever it wants.
大部分权威人士建议婴儿饿了就随时喂奶。
7. I have no intention of letting you balls it up.
我可不想让你把事情弄得一塌糊涂。
8. Once again there's been ferocious blood-letting in the township.
镇区再次发生了残忍的流血事件。
9. She could always sweet-talk Pamela into letting her stay up late.
她总能哄得帕梅拉同意她晚睡一会。
10. Hopefully a satisfactory solution can be reached without much blood letting.
有望在不引起严重内讧的情况下达成一个满意的解决方案。
11. It seems that you are letting things get you down.
看上去你快要累趴下了。
12. Sometimes the hardest part isn't letting go, but rather, learning to start over.--Nicole Sobon
有时最难的并非放下过去，而是学会重新开始。
13. Brown was constantly letting the side down.
布朗不断让家人失望。
14. You're letting your imagination run away with you.
你这是在想入非非。
15. He was scared of letting us down.
他怕让我们失望。
1. let后接第一人称
Let's have a look. 让我看一下。
Let's take a taxi! 让我们坐出租车吧!
Let's give you a hand. 让我帮助你。
Let's paint it ourselves. 我们自己来刷漆。
Let's take a taxi, shall we? 我们坐出租车好吗?
Let's start now and work till dark. 让我们现在开始工作一直到天黑。
Let's go shopping now. The shops will be / should be fairly empty. 我们去商店买东西吧。商店里人不会太多。
Let me fix you a drink. 我给你去弄点饮料。
Let me have a try. 我来试一试。
Let me show you how to do it. 我来告诉你怎样做。
Let me pay for myself. 让我自己来付我的那份钱。
Let me have another cup of tea. 给我再来一杯茶。
Let me know if you should hear some more news. 万一你听到更多消息你要通知我。
2. let后接第二人称(较少见)
Let you and I try to make this all right. 让你和我试试把这个做好。
3. let后接第三人称
Let her do what she likes. 让她做她想做的事吧。
Let the meat cook slowly. 把肉用慢火炖。
Let XYZ be a triangle. 设XYZ为一个三角形。
Let the two lines be parallel. 假设两条线是平行的。
Let every man do his best. 让每个人人尽其才。
Let him have his own way. 让他照自己的意思做吧!
Let the true cause of the accident be published. 把造成这件意外的真正原因公开吧。
Let him try that game again on me, and I'll soon put paid to it. 他如若再和我玩这把戏，我很快就会叫他收起来。
4. let后接there be句式
“Let there be no reprisals,” said the widow of the murdered man. 被害者的遗孀说：“千万不要搞复仇。”
Let there be light. 让地上有光。
Let there be no doubt in your minds about our intentions. 对于我们的意图，你们心里不要有疑问。
the traditional culture and current situation of china been taken into account, adjustment of laws to recognize the maturity of children at an early age thus seems to be hasty and impractical.
it would be ideal if everyone in society were responsible for their own actions and words, if they were in other words in dependent individuals in law. however, children over 15 are a special group, especially in china.
the adjustments of laws may require two assumptions,first, children over 15 are already mature enough to make good decisions for their own lives. second, they have the ability to pay for their misbehavior. unfortunately, nowadays children in china fail in both aspects.
it is obvious that children over 15 in china are dependent on their parents and liable to take others' opinions. so it's not the right time to allow them to do things which go beyond their ability. just let a child be a child.
短语：
let us 让我们
let go 放开；释放；发射
let me see 让我看看；让我想一想
let me tell you 让我告诉你；老实告诉你
let it be [口]随他（它）去；任他（它）那样
例句：
别让他们欺压你。
让他自己去倒茶。
她站到一边让我们过。
4.I stood aside to let her pass me.
我往边上站以让她从我身边过去。
她同意让我早走。
and和or的用法：
1、and和or的用法并列结构中，or通常用于否定句，and用于肯定句。但有时and 也可用于否定句。
2、在否定中并列结构用or 连接，但含有两个否定词的句子实际被看作是肯定结构，因此要用and。
3、or用于连接并列的单词、词组、短语或句子,表示“或者”的意思。or用在选择疑问句中,灵活译为“还是”。or用于否定句中,代替and ,表示“和”的意思。
4、or用于连接两个并列的句子,表示“否则,要不然”的意思。
and：
1. Remember, keep a positive attitude and good things will happen.
记住：保持乐观的.心态，好事自然会发生。
2. The world breaks everyone, and afterward, many are stronger at the broken places.
生活总是让我们遍体鳞伤，但到后来，那些受伤的地方会变得更坚强。
3. For what do we live, but to make sport for our neighbours, and laugh at them in our turn?
我们活着是为了什么？不就是给邻居当笑柄，再反过来笑他们。
4. When life gets hard and you want to give up, remember that life is full of ups and downs, and without the downs, the ups would mean nothing.
当生活很艰难，你想要放弃的时候，请记住，生活充满了起起落落，如果没有低谷，那站在高处也失去了意义。
5. Good luck is when an opportunity comes along and you're prepared for it.
好运就是当机会来临时，你早已做好了准备。
6. I will return, find you, love you, marry you and live without shame.
我会回去，找到你，爱你，娶你，活的光明正大。《赎罪》
7. It's not about making the amazing saves. It's the little things and small things that made great gatekeepers great.
伟大的门将不是靠神奇的扑救成就，而是靠注重小事和细节成功。
or：
1. No matter where you go in life or how old you get, there's always something new to learn about. After all, life is full of surprises.
不管你生活在哪里，你有多少岁，总有新东西要学习，毕竟，生活总是充满惊喜。
2. Remember, happiness doesn't depend upon who you are or what you have; it depends solely upon what you think.--Dale Carnegie
请记住，幸福不在于你是谁或者你拥有什么，而仅仅取决于你的心态！
3. If your skin becomes red, sore or very scaly, consult your doctor.
如果皮肤发红、瘙痒或脱皮，要向医生咨询。
4. There is nothing sinister or conspiratorial about the export licensing system.
这种出口许可制度没有任何阴险或者见不得人的东西。
5. Do you sweat a lot or flush a lot?
你常出汗或是脸上常发烫吗？
6. Serve the cake warm or at room temperature, cut in squares.
等蛋糕温热或凉至室温时切成四方块端上桌。
7. I started with the Viennese speciality frittatensuppe, or pancake soup.
我吃的第一道菜是维也纳特色菜鸡蛋饼汤，也叫炒饼汤。
（2）on表示地点、位置,有“在.旁”、“接近”、“靠近”之意.如：
a house on the main road 临大街的房子,sit on my right 坐在我的`右边
（3）on表示状态,译为“处于.情况中,从事于.”等.如：
on duty 值日,on holiday 度假
（4）on表示“在.上面”,用在表示物体的名词前.如：
on the box 在盒子上
on和over都是介词,on表示“在.上面”,指一物体与另一物体表面相接触；over表示“在.上方”,指一物体与另一物体不接触.试比较：
There is a light on the desk．桌子上有盏台灯.（light与desk接触）
There is a light over the desk．桌子上方有一盏灯.（light与desk不接触）
表示“在.上”,介词on与in必须注意习惯用法,否则会出错.不妨比较一番：
on the tree／in the tree都译为“.在树上”.前者表示树上本身所长着的叶子、花、果实等；后者表示某物或某人在树上.
on the wall／in the wall都译为“在墙上”.由于介词不同,在使用上有区别.图画、黑板、风筝等“在墙上”,是因为它们在墙的表面上,故用on the wall；门窗、钉子、洞、孔等“在墙上”,是因为它们在墙的里面,故用in the wall.
有疑问在线交谈 祝你新年快乐 天天开心 心想事成 ...
五)含as的固定词组的用法
As soon as I get to Beijing，I'll write to you.我一到北京，就给你写信。
As/So long as you study hard，you'll make progress.只要你努力，你就会取得进步。
She loves the child as if/though he were her own.她爱这个孩子如同爱自己的孩子。
As if/though也可用来引导表语从句，常用在“It appears/looks/seems...+as if/though”句型结构中。eg;
It appears as if/though it is going to clear up.看起来天要晴了。
It seems as if/though he knew nothing about it.他好像对此事一无所知。
There is no doubt as to his honesty.他的诚实是无可置疑的。
He can earn as much as 5000 dollars a month.他每月能挣5000美元。
As/So far as I know，he will come here next Monday.据我所知，他将于下星期一到这里来。
She died as a direct result of the accident.她的死是那次事故的直接结果。
8，as well为“也，还”之意。eg：
Come early，and bring your brother as well.早点来，把你的弟弟也带来。
He studied hard so as to pass the exam.他努力学习以便通过考试。(表示目的)
as……as
AS +adj(原级)+AS
AS +adv(原级)+AS
as soon as 一……就
as soon as possible 尽可能快地
as early as possible 尽可能早的
as carefully as you can 尽可能认真地
as careful as you can 尽可能认真的
so...as 一般用于否定句,as...as 一般用于肯定句,(肯定否定都能用)
so...as不可用于肯定句.as...as与so...as均可表示“与……一样”,as...as...的用法:两个as中间可以加形容词或者副词,由它要修饰的内容决定.
它们的用法有异同之处:
肯定句用as...as,不用so...as;否定句两者均可使用.例如:
I didn't go as /so far as you.我走得不像你那么远.
They walked as far as the station.他们步行到了车站.
误:They walked so far as the station.
“that”在英文中是一个使用频率很高的单词。它有四种词性，并且句法及语法功能纷繁复杂。同学们如果不能熟练掌握其用法，很可能会形成英语学习的一种障碍，从而影响其学习兴趣和效率。现将that的用法总结归纳如下：
第一、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？
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）
第二、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 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.
第三、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。
①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 not working hard enough.
② 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.）
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.
2. 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.
3. 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.
第四、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 has been knocked down.
第五，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 correct our 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.