今天小编在这给大家整理了or的用法总结英语，本文共14篇，我们一起来阅读吧!
篇1：英语as as用法总结
若有修饰成分，如twice，three times，half，a quaer等，必须置于第一个as之前。
as…as结构的另一变体形式是“as+形容词原级+名词词组+as”。
当as…as与表示重量、数量、时间、距离、价格等的计量名词连用时。往往并不表示比较。而是构成一个形容词组，意为“重达……，多达……，高达……”等。
“as+原级+as any(或ever)”、“as+原级+as…can be”、“nothing(或no)+so+原级+as…”等结构表达的是最高级意义。即在某种程度上或某方面达到极限或最大限度。
篇2：英语it 用法总结
1、人称代词IT
IT一般指物不指人,但可指小孩、婴儿和团体等.IT用于成人,有轻蔑的含义.
For example: Would you like to marry Malcom? Fancy being owned by that! Fancy seeing it every day!
2、指示代词IT
作为指示代词时,IT可以指人.
For example: Who is it?(是谁呀?)
3、非人称代词IT
(1)指时间
For example: I glanced at my watch. It was earlier than I thought.
(2)指距离
For example:
How far is it from your office to the bank?
It was a long journey to that part of the country.
(3)指天气等自然现象
For example:
Now it is clearing up, and a sparrow is beginning to chirp.
It’s damp and cold. I thingk it’s going to rain.
4、IT用于前指或后指
(1)前指
For example:
---They lost the game.
---Yes, so I hear. Isn’t it a shame?
(2)x09后指
For example:
It’s seems so full of comfort and of strength, the night.
Though no one knew it, it was the last time he would be present at the bank.
注：代词it指代if或when等引导的状语从句时,既可前指,也可后指.
5、非确指的IT
有时,it所指代的是什么,要看上下文来确定.这种IT即所谓的非确指的it(Unspecified it).
For example:
1.How’s it going with you? (你近况如何?)
2.Does it itch much? (很痒痒吗?)
3.Where does it hurt? (哪儿痛?)
4.Now you are in for it. (你现在可倒霉了!)
5.It says in the Bible: Thou shalt not steal. (圣经上说:不许偷窃.)
6.Hand it all, we can’t wait all day for him. (见鬼!我们不能整天等他呀.)
7.We had a nice time of it. (我们玩得很好.)
8.There is nothing else for it but to stand. (没有办法,只好忍受.)
9.You never had it so good. (日子过得从来没有这样好.)
10.Take it easy. (不要紧张.)
篇3：英语it 用法总结
6、IT在习惯用语中
一些含有IT的习惯用语需要牢记,以下是一般对方都熟知的,无须要明确指出来.
For example:
1.Cab it (乘车)
2.brave it out (拼命干到底)
3.walk it (步行)
4.go it alone (单枪匹马地干)
5.beat it (走,滚)
6.make it (办成功)
7.come it (尽自己之分内事情)
8.come it strong (做得过分)
9.lord it over (欺压)
10.take it (猜想,以为,断定;[口][常与 can, be able to 连用]忍受得住(痛苦、批评、困难, 嘲笑等))
11.take it out of somebody (拿某人出气)
12.have it out with somebody (与某人讲个明白)
13.be hard put to it (在艰难之中)
14.Is that it? (你就要我做这些吗?= Is that all you wanted me for? )
15.You’re it. (你是下一个)
7、引词IT
(1)IT用做引词
A.形式主语
a.真实主语为不定式
For example:
It was his duty to attend to the matter. (处理那事是他的责任)
It was not within my power to answer the question. (我无能力回答这个问题)
b.真实主语为不定式复合结构
For example:
It is getting harder every day for a lazy man to get a living. (懒汉谋生是日益困难了)
What time would it be most convenient for me to call again? (何时我再给你打电话最合适?)
It’s very good of you to have listened to me. (感谢你,能听我讲.)
It’s very thoughtful and kind of you to offer me this lovely holiday. (您能给我这么美好的假日实在是想得太周到和太友善了)
c.真实主语为动名词
For example:
It’s no use saying any more about what I think. (我如何想的再说也没有用了.)
Do you think it’s worth while quarrelling with me? (你认为与我吵架值得吗?)
d.真实主语为动名词复合结构
For example:
It has been a great honor your coming to visit me. (你的来访是我很大的荣幸.)
It would have been so bad her overhearing. (她如果偷听到那就糟糕了.)
I’m afraid it vexes her my having brought Roly.(我恐怕我带罗力来使她生气了)
e.真实主语为主语从句
For example:
It seems that he is rich.. (看起来他很富有.)
It doesn’t matter what you do.(你干什么都没有关系)
It was clear enough what she meant.(她的意思十分清楚)
He was an old man, and it did not matter much where he lived.(他年事已高,在哪儿居住都无所谓)
It’ a pity he doesn’t swim. (他不会游泳,真遗憾)
B.形式宾语
a.真实宾语为不定时
For example:
I find it easy enough to get on with Pam.. (我觉得与帕姆相处很容易.)
I would think it worth while to go.(我认为去是值得的.)
He thought it best to be on his guard. (他认为他最好还是要警惕.)
He made it a rule to speak in Parliament at least once every session. (他规定自己在议会每次开会时至少发言一次.)
He felt it his duty to mention the fact to Mr. Otis. (他觉得把事实告诉奥蒂斯先生是他的职责)
b.真实主语为动名词
For example:
You must find it exciting working here.. (你一定会发现在此工作是很令人兴奋的.)
I think it very unwise going on as we are without definite agreement.(我认为我们没有明确的协议就进行是不明智的.)
He find it a great privation not being allowed to smoke there. (他觉得在那里不能吸烟对他是一大痛苦.)
注：以上例句皆可不用形式宾语,可改写为：
You must find working here exciting.
I think going on as we are without definite agreement very unwise.
He found not being allowed to smoke there a great privation.
c.真实宾语为宾语从句
For example:
I think it best that you should stay here. (我认为你最好留在这里.)
I used to feel it a terrible thing that my mother should have to toil so endlessly. (我曾老觉得母亲不得不无休止地操劳是一件可怕的事情.)
I take it you have been out. (我想你出去过了.)
I took it for granted that you would stay with us. (我认为你当然会留在我们这里的.)
I have it on my conscience that I offended you. (我心里老嘀咕着我得罪了你)
They kept it quiet that he was dead. (对于他的死他们没有透露一丝口风.)
(2)引词IT用于强调结构中
①英语中常用的强调结构是：“It is (was)+被强调的部分(主语、宾语或状语)+ who(that)…”.一般说来,被强调部分指人时用who,指物时用that(但that亦可指人).注意：强调结构在强调状语时,只可用that从句,不可用which.
For example: John wore his best suit to the dance last night.(约翰昨晚他穿着他最好的一套衣服去参加舞会)
It was John who (that) wore his best suit to the dance last night.
It was his best suit (that) John wore to the dance last night.
It was last night (that) John wore his best suit to the dance.
It was to the dance that John wore his best suit last night.
②强调结构也可强调短语和从句(包括because,only when,who,whom,whose,that,which等引导的从句).
For example:
I suspected it was on her orders that you were bringing him here.(我怀疑你是遵照她的吩咐要把他带到这儿来的)
It was because I wanted to buy a dictionary that I went to town yesterday. (我昨天是由于想买一本字典而进城的.)
It is only when you nearly lose someone that you become fully conscious of how much you value them(只有你差一点失去某一个人时,你才会充分意识到你是多么珍视他们.)
It must be your mother who (whom, that) you are thinking of.(你在想的一定是你的母亲.)
It was your brother to whom I offered a dollar for his knife yesterday.(我昨天给了你兄弟1元钱买他的小刀.)
It is Uncle Bill whose address I lost.(比尔叔叔的地址我丢了.)
It deserves attention that it is especially the verb to do which is often found in the active voice.(应该注意, 特别是行为动词常用在主动语态中.)
③表语与宾语补语偶尔也可为被强调的部分.但通常情况下,表语一般不可用作被强调的部分.
For example:
It was a doctor that he eventually became.(他最后成了一个医生)
It’s dark green that we’ve painted the kitchen.(我们把厨房漆成了深绿色)
④强调结构的时态一般应该一致.但也有例外的例子.
For example:
It is not I who am angry.(发怒的不是我.)
I was my two sisters who knew her best(是我的两个姐妹最了解他.)
I will not be you who will have to take the blame for this.(对此受责难的将不是你.)
For exceptional example:
It is Miss Williams who enjoyed reading novels as a pastime. (是威廉姆斯小姐以读小说来消遣.)
It is these very novels that Miss Williams enjoyed reading as a pastime.(威廉姆斯小姐作为消遣所读的小说就是这些.)
⑤强调结构不但可以用于独立句中,也可以用在从句之中.
For example:
It deserves attention that it is especially the verb to do which is often found in the active voice.(应该注意, 特别是行为动词常用在主动语态中.)
I suspected it was on her orders that you were bringing him here.(我怀疑你是遵照她的吩咐要把他带到这儿来的)
He told me that it was liberation that brought about a complete change in his life. (他告诉我是解放才使他的生活有了翻天覆地的变化.)
⑥强调结构中的that 与who在非正式文体中可以省略.有时还可以省去句首的It is (was).
For example:
I suspected it was on her orders you were bringing him here.(我怀疑你是遵照她的吩咐要把他带到这儿来的)
A good, honest trade you are learning, Sir Peter! (彼得爵士,你学得是一种很好而诚实的一行啊!)
⑦强调结构中的被强调部分有时可放在句首.
For example:
Now was it that his life was done, and the fate which he could not escape was upon him.(就在这时,他的生命完结了,他所逃脱不了的命运降临了.)
⑧It is(was)之后可有一个以上的被强调部分.
For example:
It was she who was lying in the corridor and the stranger who bent over her. “Did I faint?” she asked.(是她躺在过道上,是那个陌生人在俯视她.“我晕倒了吗?”她问道.)
篇4：英语with的用法总结
例句：
Gill chortled with delight.
吉尔高兴得哈哈大笑。
Roberta sighed with relief.
罗伯塔松了口气。
Ellen pealed with laughter.
埃伦忽然大笑起来。
篇5：英语by的用法总结
by的用法归纳
一、by+地点名词。表方位，意为：“在…旁边”。
例句：
Our teacher was sitting by the window.
我们的老师正坐在窗户旁边。
二、by+时间名词。意为：“到…时(已发生某事)，此时谓语多用完成时;最晚、不迟于…，在…之前”。
例句：
I shall be back by 5 o’clock.
我最迟五点回来。
三、by+v.-ing结构。意为“通过……，以……的方式”。
例句：
Our bodies are strengthened by taking exercise. Similarly,our minds are developed by learning.
身体是靠锻炼强壮的，同样，大脑是靠学习开发的'。
四、by+人称代词宾格，意为“经过”。
例句：
He walked by me without saying a word.
他走过我的身旁，没有说话。
五、by+人，意为“被;由”。
例句：
The movie is loved by people all over Asia.
那个电影被全亚洲人喜爱。
六、by+地点或工具等具体名词。表路线、途径，意为：“通过(某物、某地)，取道…”。
例句：
The man entered the room by the back door.
那人通过后门进入了房间。
七、by的常用短语
Study by heart 用心学
little by little 渐渐地
one by one 逐一
by chance 碰巧，偶然
by the river 在河边
by mistake 错误地
by nature 天生的
by oneself 亲自
篇6：of的用法总结of的英语用法总结
1、(表示时间)在…的`,在…之前; 在…期间
What do you do of a Saturday?星期六你干什么?
2、(表示方式)根据
She did it of her own will.她是自愿这么做的。
3、(表示对象)对于,就…而言
He felt quite certain of success.他对成功很有把握。
4、(表示原因)由于,因为
I was sick of their fun and games.他们的嬉闹让我厌烦。
5、(表示方位)在; 位于
New York is east of Washington.纽约在华盛顿以东。
6、(表示范围)在…之中
Tom is the eldest of the family.汤姆是家里年龄最大的。
7、(表示结果)在…方面
The place is easy of access.这地方容易进入。
8、(表示目的)用于…的
This is a house of prayer.这是一座教堂。
篇7：英语倒装句用法经典总结
英语倒装句用法经典总结
1. 否定副词位于句首时的倒装
在正式文体中，never, seldom, rarely, little, hardly, scarcely, no sooner, no longer, nowhere 等含有否定意义的副词若位于句首，则其后要用部分倒装：
I shall never forgive him. / Never shall I forgive him. 我永远不会宽恕他。
He seldom goes out for dinner. / Seldom does he go out for dinner. 他很少出去吃饭。
She hardly has time to listen to music. / Hardly does she have time to listen to music. 她几乎没时间听音乐。
He little realizes how important this meeting is. / Little does he realize how important this meeting is. 他不甚明白这个会议的重要性。
We had no sooner reached the airport than the plane took off. / No sooner had we reached the airport than the plane took off. 我们刚到机场,飞机就起飞了。
【注意】
(1) 对于not…until句型，当not until…位于句首时，其后的主句要用倒装语序：
He didn’t leave the room until the rain stopped. / Not until the rain stopped did he leave the room. 雨停了之后他才离开这房间。
(2) 某些起副词作用的介词短语，由于含有否定词，若位于句首，其后要用部分倒装：
On no accounts must this switch be touched. 这个开关是绝不能触摸的。
In [Under] no circumstances will I lend money to him.无论如何我也不会再借钱给他了。
但是，in no time(立即，马上)位于句首时，其后无需用倒装语序：
In no time he worked out the problem. 他马上就算出了那道题。
2.“only+状语”位于句首时的倒装
当一个状语受副词only的修饰且置于句首时，其后用部分倒装语序：
Only then did he realize that he was wrong. 到那时他才意识到他错了。
Only in this way are you able to do it well. 你只有用这种方法才能把它做好。
Only when he returned home did he realize what had happened. 当他回到家里时，才知道出了什么事。
3. “so+adj. / adv.”位于句首时的倒装
副词so后接形容词或副词位于句首时，其后用部分倒装：
So cold was the weather that we had to stay at home. 天气太冷，我们只好呆在家里。
So fast does light travel that we can hardly imagine its speed. 光速很快，我们几乎没法想像它的速度。
So sudden was the attack that we had no time to escape. 袭击来得非常突然，我们来不及逃跑。
4.“so+助动词+主语”倒装
当要表示前面提出的某一肯定的'情况也同样适合于后者，通常就要用“So+助动词+主语”这种倒装结构：
You are young and so am I. 你年轻，我也年轻。
She likes music and so do I. 她喜欢音乐，我也喜欢。
If he can do it, so can I. 要是他能做此事，我也能。
【注意】
(1) 若前面提出某一否定的情况，要表示后者也属于同样的否定情况，则应将其中的so改为neither或nor：
You aren’t young and neither am I. 你不年轻，我也不年轻。
She hasn’t read it and nor have I. 她没有读它，我也没有读。
(2) 注意该结构与表示强调或同意的“so+主语+特殊动词”结构的区别：
“It was cold yesterday.” “So it was.” “昨天很冷。”“的确很冷。”
“Father, you promised.” “Well, so I did.” “爸爸，你答应过的。”“嗯，是答应过。”
5. 由not only…but also引出的倒装
当not only…but also位于句首引出句子时，not only 后的句子通常用部分倒装形式：
Not only is he a teacher, but he is also a poet. 他不仅是一位教师，而且是一位诗人。
Not only did he speak more correctly, but he spoke more easily. 不仅他讲得更正确，也讲得更不费劲了。
6. 虚拟条件句的省略与倒装
当if引导的虚拟条件从句中含有had, were, should等时，如将if省略，则要将had, were, should等移到主语前，构成倒装句：
Had you come yesterday, you would have seen him.若你昨天来，你就会见到他了。
Should you require anything give me a ring. 如果需要什么，可以给我打电话。
Were it not for your help, I would still be homeless. 要不是你帮助，我会仍然无家可归。
【注意】省略if后提前的had不一定是助动词：
Had I money, I would buy it. 假若我有钱，我就会买它。
完全倒装的四种主要类型
1. here 和there位于句首时的倒装
表示地点的here和 there位于句首时，其后用完全倒装形式。这类倒装句的谓语通常是动词be和come, go等表示移动或动态的不及物动词：
Here’s Tom. 汤姆在这里。
There’s Jim. 吉姆在那儿。
Here comes the bus. 公共汽车来了。
There goes the bell. 铃响了。
There goes the last train. 最后一班火车开走了。
【注意】
(1) 以上倒装句中的谓语动词come和go不能用进行时态，即不能说 Here is coming the bus。
(2) 若主语为代词，则不倒装：
Here I am. 我在这儿。/ 我来了。
Here it comes. 它来了。
(3) 其中的动词有时也可能是stand, lie, live等表示状态的动词(表示存在)：
There stood a desk against the wall. 靠墙放着一张书桌。
Once upon a time there lived a man known by the name of Beef. 从前有个人名叫比夫。
2. away和down等位于句首时的倒装
地点副词away, down, in, off, out, over, round, up 等位于句首时，其后用完全倒装语序。这类倒装句的谓语通常表示动态的不及物动词：
Away went the runners. 赛跑选手们跑远了。
Round and round flew the plane. 飞机盘旋着。
The door opened and in came Mr Smith. 门开了，史密斯先生进了来。
Down came the rain and up went the umbrellas. 下雨了，伞都撑起来了。
【注意】
若主语为人称代词，则不能用倒装：
Away he went. 他跑远了。
Down it came. 它掉了下来。
3. 状语或表语位于句首时的倒装
为了保持句子平衡或使上下文衔接紧密，有时可将状语或表语置于句首，句中主语和谓语完全倒装：
Among these people was his friend Jim. 他的朋友吉姆就在这些人当中。
By the window sat a young man with a magazine in his hand. 窗户边坐着一个年轻人，手里拿着一本杂志。
【注意】
在表语置于句首的这类倒装结构中，要注意其中的谓语应与其后的主语保持一致，而不是与位于句首的表语保持一致。比较：
In the box was a cat. 箱子里是一只猫。
In the box were some cats. 箱子里是一些猫。
4. 分词和不定式置于句首的倒装
有时为了强调，可将谓语部分的现在分词、过去分词或不定式置于句首，从而构成倒装：
Buried in the sands was an ancient village. 一个古老的村庄被埋在这沙土之中。
Standing beside the table was his wife. 站在桌旁的是他的妻子。
To be carefully considered are the following questions. 下列问题要仔细考虑。
涉及only的倒装及考题分析
按英语习惯同，当“only+状语”位于句首时，其后句子要用部分倒装。如：
Only then did he realize that he was wrong. 到那时他才意识到他错了。
Only in this way are you able to do it well. 你只有用这种方法才能把它做好。
Only in this way can our honour be saved. 只有这样，才能保住我们的荣誉。
Only then did I understand what she meant. 只有到那时我才明白她的意思。
Only after her death was I able to appreciate her. 只有到她死后我才认识到她的价值。
Only when he returned home did he realize what had happened. 当他回到家里时,才知道出了什么事。
Only in this way can we learn English. 只有这样才能学会英语。
The pilot reassured the passengers. Only then did I realize how dangerous the situation had been. 飞机驾驶员要乘客们放心，这时我才明白刚才的情况有多危险。
Only by shouting was he able to make himself heard. 他只有叫喊才能让别人听到他。
Only when we landed did we see how badly the plane had been damaged. 我们只是在着陆之后才看到飞机损坏的严重程度。
Only on one point do I agree with you. 只有一点，我同意你的说法。
篇8：英语as as的用法总结
三、若有修饰成分，如twice，three times，half，a quaer等，必须置于第一个as之前。
四、as…as结构的另一变体形式是“as+形容词原级+名词词组+as”
五、当as…as与表示重量、数量、时间、距离、价格等的计量名词连用时。往往并不表示比较。而是构成一个形容词组，意为“重达……，多达……，高达……”等。
六、“as+原级+as any(或ever)”、“as+原级+as…can be”、“nothing(或no)+so+原级+as…”等结构表达的是最高级意义。即在某种程度上或某方面达到极限或最大限度。
初中是开始学习系统语法知识的.重要阶段。这阶段语法学习好了，以后语法就会感到很轻松。首先应该明确是初中的时候我们学习的更多的是词法而不是句法，因为毕竟从简单开始吧，就算是中考题也基本上没有多少句法的题，所以初中一定要把重心放在词法上。
学习英语贵在坚持，找到适合自己的方法，多运用多温故。英语学习过程是一种观察，模拟，认识，识记，思考，记忆等综合的心理活动过程。建议从学单词开始就听写背单词，建立起人对英语单词声音形象的条件反射能力。
篇9：or的用法总结英语
or在作“也不”解时通常用于否定句; 作“还是”解时常用于疑问句。
The operation could prolong his life by two or three years.
这次手术可使他多活两三年。
She always had one or two students boarding with her.
她的家总有一两名寄宿学生。
How much will it cost, more or less?
这个大概得花多少钱？
Is this a social visit, or is it business?
这是社交性的'拜访，还是业务性的？
I could come next week, or the week after.
我可能下周来，或者再下一周。
篇10：英语take的用法总结
ake用法：
take可以用作动词：
take是英语中含义最多,搭配能力最强的动词之一,基本意思是“拿,取,带,抓”,指用手取物、接受东西、把人或物移到某处。可根据上下文灵活译为“吃,喝,服(药),容纳”“接,接受,提,买”“以为,把…看作…”“花费”“记录,量取”“拍摄”“承担,容忍”“乘坐,搭乘,租用”“取得,获得,得到”“采取,选”“攻下,占领,夺走,赢得”“上钩”“发生效用”等。
take可用作及物动词,也可用作不及物动词。用作及物动词时可接名词或代词作宾语,也可接双宾语,作“带给”解时其间接宾语可转化为介词to的宾语。用作不及物动词时主动形式可表示被动意义。
take与某些名词连用,表示做某一动作,相当于have。
take用作动词的.用法例句：
Please take the trash to the garbage can.请将垃圾拿到垃圾筒去。
Take money from the bank when needed.需要时,把钱从银行里取出来。
We are ready to take your order.我们随时准备执行您的命令。
take可以用作名词：
take用作名词的意思是“捕获量,收入额”,指捕鱼、鸟兽等的数量,也可指交易的金额、赃款、所得金额等,通常用作单数形式。
take也可作“镜头”解,指已拍摄或未拍摄的连续的电影或电视镜头。
take还可作“奏效,反应; 成功”解。
take用作名词的用法例句：
Love includes gives and takes.爱情包含着给予和索取。
The lioness brought her take to her baby.母狮子把捕获的猎物叼给了狮宝宝。
篇11：英语help的用法总结
help相关短语：
help oneself（to）自用；自取所需
with the help of 在…的帮助下
help sb with sth 帮某人干某事
help with 帮忙某人做…
help each other 互相帮助
need help 需要帮助
can't help 禁不住，忍不住；不得不
ask for help 寻求帮助；求助；请求帮助
help yourself 请自便
help out 帮助…摆脱困难
help on 鼓励；促进
help sb.（to）do sth.帮助某人做某事
be of some/no/much help to sb.对某人有些/没有/很有帮助
篇12：小学英语on的用法总结
Text me when you're on your way.
路上给我发短信吧。
I like to be on my own sometimes.
有时候我喜欢一个人待着。
Take the first turning on the right.
在第一个路口向右拐。
Number Ten had nothing to say on the matter.
唐宁街十号对此不作评论。
Lack of money will have an adverse effect on our research programme.
缺少资金将对我们的研究方案有不利影响。
篇13：高考英语知识点总结：as用法
(5)as well as
She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。
一些带有as...as结构的常见短语归纳：
as busy as a bee像蜜蜂一样忙碌
as easy as ABC像ABC一样容易
as deep as a well像井一样深
as light as a feather像羽毛一样轻
as soft as butter像黄油一样软
as rich as a Jew像犹太人一样富裕
2. as用作连词引导时间状语从句
as与when，while都是引导时间状语从句的从属连词，含义都是“当……的时候”。但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生;用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生;用as时，主句和从句的动作同时发生，具有延续的含义。例如：
(1)It was snowing when he arrived at the construction site.他到达工地时，天正在下雪。
(2)He was watching TV while his mother was cooking.他母亲做饭时他在看电视。
(3) You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。
3. as用作连词引导原因状语从句
as，because，since都可以表示因果关系，连接原因状语从句，含义是“因为，由于”，但它们有区别：because表示的语气最强;as一般放在句首，语气较弱，较口语化;since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作“既然”。例如：
(1) He will succeed because he is in earnest.他一定会成功，因为他很认真。
(2) Since you are so sure of it he”ll believe you.既然你对此如此有把握，他会相信你的。
(3) As rain has fallen, the air is cooler.因为下过雨，空气比较清爽。
4. as作连词引导让步状语从句
as与although (或though)，however (或no matter how)等都可以引导让步状语从句，含义是“虽然，尽管”，但它们有区别：although语气稍正式些，可放在句首，也可放在句中，主句中不能再用but，但可以用yet;as所表示的语气较强，引导的让步状语从句用倒装语序;however引导让步状语从句时，它的后面可跟形容词或副词，也要用倒装语序。例如：
(1) Although he is quite old, he still jogs every day.他虽然年纪相当大，仍然每天慢跑。
(2) Strange as it may seem, nobody was injured in the accident.
这次意外虽然显得令人不可思议，却没有人受伤。
(3) However hard he may try, he will not attain his goal.无论他怎样努力也达不到目标。
篇14：英语冠词的用法总结
冠词是一种虚词，是印欧语系和闪含语系的诸语中，位于名词或名词词组之前或之后，在句子里主要是对名词起限定作用的词。其分为定冠词，比如the，以及不定冠词，比如a和an。
不定冠词a (an)与数词one 同源，是“一个”的意思。
定冠词的用法
定冠词the与指示代词this，that同源，有“那(这)个”的意思。
1)特指双方都明白的人或物：Take the medicine.把药吃了。
2)上文提到过的人或事： He bought a house. I’ve been to the house.
3)指世上独一物二的事物：the sun， the sky， the moon， the earth
4)单数名词连用表示一类事物，如：the dollar 美元;
the fox 狐狸;或与形容词或分词连用，表示一类人：the rich 富人; the living 生者。
5)用在序数词和形容词最高级，及形容词only， very， same等前面：
Where do you live? I live on the second floor.你住在哪?我住在二层。
6)与复数名词连用，指整个群体：
They are the teachers of this school.指全体教师)
They are teachers of this school.(指部分教师)
7)表示所有，相当于物主代词，用在表示身体部位的名词前：
She caught me by the arm..她抓住了我的手臂。
8)用在某些由普通名词构成的国家名称、机关团体、阶级、等专有名词前：
the People‘s Republic of China中华人民共和国
9)用在表示乐器的名词之前：She plays the piano.她会弹钢琴。
10) 用在姓氏的复数名词之前，表示一家人：the Greens格林一家人 (或格林夫妇)
11) 用在惯用语中：
in the day， in the morning (afternoon，evening)，the day after tomorrow
the day before yesterday， the next morning， in the sky (water，field，country)
in the dark， in the rain， in the distance， in the middle (of)，in the end，
on the whole， by the way， go to the theatre
零冠词的用法
冠词与形容词+名词结构
1) 两个形容词都有冠词，表示两个不同东西。
He raises a black and a white cat.他养了一只黑猫和一只白猫。
2) 如后一个形容词无冠词，则指一物。
He raises a black and white cat.他养了一只花猫。
冠词位置
1) 不定冠词位置 不定冠词常位于名词或名词修饰语前。注意：
a. 位于下列形容词之后： such，what，many，half，
such an animal; Many a man
b. 当名词前的形容词被副词as， so， too， how， however， enough修饰时，不定冠词应放在形容词之后：It is as pleasant a day as I have ever spent.
c. quite，rather与单数名词连用，冠词放在其后。
但当rather，quite 前仍有形容词，不定冠词放其前后均可。如：quite a lot
d. 在as，though 引导的让步状语从句中，当标语为形容词修饰的名词时，不定冠词放形容词后： Brave a man though he is，he trembles at the sight of snakes.
当名词被比较级形容词修饰时，不定冠词通常置于比较级形容词之后。
2) 定冠词位置 定冠词通常位于名词或名词修饰语前，但放在all， both，double，half，twice，three times等词之后，名词之前。
All the students in the class went out.班里的所有学生都出去了。
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