高考英语As的用法总结.doc

As的用法1。as是连词，表示“随着”的意义。lives是life的复数，意义是“生活”。2。as是连词，表示“因为，由于”的意义。wanting是现在分词，表示主动意义，wanting to buy cars=who want to buy cars。As的用法小结as可以作连词、介词及关系代词和副词。现将其用法小结如下:（一）、 as作连词的用法:1.作“在-期间，当-的时候”引导时间状语从句.注意与when、 while的用法区别。下列情形时,只用as, 而不用when或while。1)用于表示同一个人的两种动作交替进行,指一边-一边. 如:The girl sings as she goes to school.He looked behind occasionally as he went forward in the forest.2)表示两个同步发生的动作或行?意思是随着-的发展.如:As time went on / by, she became more and more beautiful .As children get older, they become more and more interested in everything.3)表示两个短暂行为或事情几乎同时发生.如:I watched her as she read the book.I thought of it just as you opened your mouth.Just as the flying worm hit her face, she gave a loud cry.4)接在名词后面表示某一个年龄段时.如:As a young man, he was active in sports.when作当的时候解,可以指较短的(一点)时间,也可指一段时间。如:When I was at college, I could speak several foreign languages. When the clock struck twelve, I had slept for 2hours. while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:Work while you work. Play while you play.2. As =Since 作既然、由于解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如: As hes been ill for ages, I will help him.As / Since youre not feeling well, you may stay at home.As he wasnt ready , we went without him.3. As =in the way that作像、按照的方式解,引导方式状语从句。如:Do as I told you.Remember, you must do everything as I do.4. 用于as- as或not / so/ as - as中,前一个as是副词,后一个as是连词,引导比较状语从句。如:They helped the old as much as possible.I dont speak English so/ as well as she does.5. 表示虽然,尽管 等,引导让步状语从句,常用倒装语序,模式为:adj. /adv. / n.+as +主语+谓语+主句。如: Young as he is, he knows much.Tired as they were, they walked on.6. 表示也-一样。 She is a doctor, as was her husband.（二）、 as作关系代词,引导定语从句,表示正如,这一点.如:He is very careful, as we all know.As is well-known, Taiwan belongs to China.另外,当先行词被the same, such等词修饰时,常用as来引导定语从句。如:Such a clever girl as she can learn anything quickly.I was reading the same book as he bought yesterday.（三）、as作介词的用法.1.表示好像。如:He dressed as a policeman.2. 表示作为当作。如：I found a job as a guide.3. 当某人是某身份时。如：As a child , she was sent to abroad.4. as引导的介词短语大多用作状语,as译为作为;少数情况可引起宾语补足语。如:As a Party member, Ill take the lead in everything. (状语)She works as a model. (状语)She has me as one of her best friends.(引起宾语补足语)（四）、作副词的用法 1 表示与-等同。如：This dress is twice as expensive as that one. 2 像，如等。如：As before, he remained unmoved.总之，通过以上的分析，我们对as的词性和用法有了比较全面的理解和把握，才能在实际的运用中做到心中有数，应付裕如。as.as意为“和一样”，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。其基本结构为：as+ adj./ adv. +as。例如：(1)This film is as interesting as that one.这部电影和那部电影一样有趣。(2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。其否定式为not as/so +adj./ adv. +as。例如：This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。总结1.asas结构中，要使用形容词或副词的原形。2.asas结构用于肯定句或否定句，soas只用于否定句，用来表示“不如那样”。值得注意的是：它表示的内容总是前者不如后者。使用副词表示“不相等”的句型中，“not as/soas”中的not要和助动词do,does,did等一起放在行为动词前，来构成否定句3.asas结构中，若出现名词，一般将名词放在asas中间。若有形容词作定语修饰单数可数名词，其前的不定冠词a/an，须放在形容词之后。4.asas结构中如出现表示倍数的词，应放在asas结构之前。如：Our school is four times as large as yours.我们的学校比你们的学校要大四倍。5.asas结构后接具体数字时，是表示长、短、高、矮、重、轻等的程度，而不是表示两者的比较。如：Some stones weigh as much as fifteen tons.有些石头重达十五吨。伴随状语知识大全定义:伴随状语是指状语从句的动作伴随主句发生，它的特点是：它所表达的动作或状态是伴随着句子谓语动词的动作而发生或存在的。 例如： He sat in the armchair，reading a newspaper. 他坐在扶手椅里读报。 All night long he lay awake，thinking of the problem. 他整夜躺在床上睡不着，思考着那个问题。 伴随状语出现的条件是由一个主语发出两个动作或同一个主语处于两种状态，或同一个主语发出一个动作时又伴随有某一种状态。伴随状语的逻辑主语一般情况下必须是全句的主语，伴随状语与谓语动词所表示的动作或状态是同时发生的。 伴随状语几种表示方法 一、使用分词形式 The dog entered the room, following his master(这条狗跟着主人进了屋)。 The master entered the room,followed by his dog(主人进了屋，后面跟着他的狗)。 二、用with复合结构 The little girls were playing with snow with their hands frozen red(小女孩们在玩雪，手都冻红了)。 三、用独立主格结构 The little boy goes to school, the little dog accompanying him every day(这小孩每天去上学，那条小狗陪伴着他)。 四、用形容词 Crusoe went home, full of fear(克鲁索满怀恐惧地回家)。 Confident of the victory the players are fighting hard(运动员们对比赛夺胜满怀信心奋力拼搏)。 The match will be broadcast live(这场比赛将作实况转播)。 He left home young and came back old(他少小离家老大回)。 五、用名词 He went away a beggar but returned a millionaire(他讨吃要饭离家，腰缠万贯回归)。 He who had been twice prime minister of the country, died civilian(他曾两度出任这个国家的总理，而死的时候却是一个平民)。 六、用介词短语 The girl came back to her mother in tears.(这女孩眼泪汪汪地回到母亲身边)。 How can you go to the wedding party in rags(你怎能衣衫褴褛地去参加婚宴)？ I went home out of breath(我上气不接下气地回家)。 伴随状语的判断The dog entered the room, following his master.一般在分词短语（现在分词表主动 过去表被动）前有逗号的是伴随状语。Once的用法1. once用作连词时，意为“一旦就”，用于连接时间状语从句，相当于as soon as。如： Once you start, you will never give up. 一旦你开始了，你就不要放弃。 Once you begin to read it, you will like it. 一旦你开始读，你就会喜欢它。 Physics is easy to learn once you understand the rules. 一旦你理解了规则，物理就不难学了。 注意：once引导的是时间状语从句，从句要用一般现在时代替将来时。 2. once用作副词时，意为“曾经；一度；从前”。它是一个不确定的时间副词，其位置一般是在行为动词之前，系动词之后。如： Once he lived in America, but now he lives in England. 他曾经生活在美国，但现在他生活在英国。 His song was once very popular among the young people. 他的歌一度在年轻人中很流行。 My father once employed a young man named Johnson. 我的父亲曾经雇佣了一个名叫约翰逊的小伙子。 3. once用作副词，也可意为“一次”的意思。两次是“twice”，三次是“three times”，四次是“four times”。 The old professor comes to see us once a week. 那个老教授一周来看我们一次。 Tell us the story once more. 把故事再给我们讲一次。 4. 注意once用作副词时，在句中的位置不同表示的意思也不同，所以要特别注意。如： I once went to Shanghai. 我曾经去过上海。 I went to Shanghai once. 我去过上海一次。 5. once构成的一些短语的用法： （1）at once（立刻；马上） All of you should go there at once. 你们所有人都应该立刻去那儿。 Finish the task at once. 请立刻完成任务。 （2）once again（再一次；又一次），相当于once more。 Let me hear you sing once again/ once more. 让我听你再唱一遍吧。 Read the passage once more. 把课文再读一遍。 （3）once in a while（偶尔；间或） We went to see our English teacher once in a while. 我们偶尔去看我们的英语老师。 （4）all at once（突然），相当于suddenly。 All at once, they rushed out altogether. 突然，他们都一起冲出去了。 （5）once upon a time（很早以前；从前） Once upon a time there was an old man named John Hill. 从前有一个名叫约翰希尔的老人。