《倍数表达法(共3页).doc》由会员分享，可在线阅读，更多相关《倍数表达法(共3页).doc（3页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、精选优质文档-倾情为你奉上倍数表达法与as 用法汇总倍数表达法是英语教学的重点，也是历届的热点。当我们要表达甲是乙的几倍时，通常用下面三个句型来表示：1. “A+倍数+形容词或副词的比较级+than+B”，表示“A比B大（长、高、宽等）多少倍”。如：This rope is _that one. 这根绳子是那根绳子的两倍长（比那根绳子长一倍）。This hall is _ our classroom. 这个大厅比我们的教室大四倍（是我们教室的五倍）。The car runs _that truck. 这辆小车的速度比那辆卡车快一倍（是那辆卡车的两倍）。2.“A+倍数+as+形容词或副词的原级+
2、as+B”，表示“A正好是B的多少倍”。如：Asia is _ Europe. 亚洲的面积是欧洲的四倍。This big stone is _that one. 这块大石头的重量是那块的三倍。The plane flew_ the kite. 那架飞机的飞行高度是那只风筝的十倍。3. “A+倍数+the size/height/length/width/weight+of+B”，表示“A正好是B的多少倍”。如：This street is _ that one. 这条街是那条街的四倍长。This hill is _that small one. 这座山的高度是那座小山的四倍。除掌握倍数表达的三
3、个常规句型外，我们更要注意的是其常规句型的变形及其特殊规律。一 常规句型的变形1. “ times more+名词（可数或不可数）+than+被比对象”。如：There are _ in our library than in yours. 我们图书馆里的书比你们图书馆多四倍。We have produced _ than we did last year. 我们今年生产的粮食是去年的两倍。2. “ times as many/much+名词+as+被比对象”。如：There is _ in this pot as in that one. 这个壶里装的水是那个壶里的四倍。There are
4、six times _. 学生数量是我们预期的六倍。3 “ times+that+of+被比对象 ”。如：In this workshop, the output of July was _. 这个车间7月份的产量是1月份的4倍。5. “times+compared with+被比对象”。如：The number of the students in our school has increased _. 我们学校的学生人数比1980年增加了三倍。6. “times+what+从句”。如：The production is now three times _. 现在的产量比十年前增加了两倍。T
5、he dictionary costs _.这本字典现在花的钱是十年前的三倍.(use)二，平级比较1. as.as的用法(1). as+ adj./ adv. +as和一样使用时要注意第一个as为副词，第二个as为连词. 其否定式为not as/so +adj./ adv. +asThis film is as interesting as that one.这部电影和那部电影一样有趣。Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。This dictionary is not as/so useful as you think.这本字
6、典不如你想象的那样有用。 (2)若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。例如： Your bag is twice as expensive as mine.你的袋子比我的贵一倍。(3). as much / many + 名词 + as分句。例如：He took as much butter as he needed.She has written as many essays as her brother (has).(4) as + 形容词原级 + （a/an）名词 + as 分句。例如： George is as
7、 efficient a worker as Jack.= George is a worker as efficient as Jack I dont want as _.我不想买这么贵的车。 Hardly ever have I heard as_.(这么美的音乐). I cant drink as _.(这么甜的咖啡) They are as _.他们是像你们一样可爱的孩子。 2. 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
8、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，通常两个动作一直相随，很可能时间相同。如：he was thinking of a question as watching the TV。这两个动作就是一直相随的。 1. a
9、s意为“一边一边”或“与同时”，重在表示动作同时发生、伴随进行。while只指“时间段”，不指“时间点”，从句的动词只限于持续性动词。 2.从句表示随时间推移连词能用as，不用while。 As the day went on, the weather got worse.日子一天天过去，天气越变越坏。 3. as引导短暂性动作的动词。 Just as I stopped my car, a man came up to me.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 w
10、as 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=now that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 beca
11、use he is in earnest.他一定会成功，因为他很认真。 (2) Since you are so sure of it hell 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： though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
12、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(形容词或副词提前主谓不倒装)。例如： (1) Though 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 / though 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。Child as he was，he knew what was the right thing to do.Hard as he stu
13、died，he did not get good marks in the exam Try as he may，he will fail in the examination.Die as he did，his inspiration lived on.(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。 二、as作关系代词的用法 关系代词as引导定语从句时，既可以单独使用，也可以与其他词连用，其用法要比that和which更为复杂。 1. as引导定语从句与其他词连用 用于the same.as结构中
14、 This is the same book as I read last week.这本书和我上周读的那本是一样的。 用于such.as结构中 I dont like such books as he recommends.我不喜欢他推荐的那些书。 用于so +adj. + a/an + n. (单数) + as 结构中 I am not so strong a man as I was.我已经没有从前那么强壮了。 2. as单独引导定语从句 as单独引导定语从句时，先行词可以是一个词，也可以是一个句子或短语。例如： (1) She is late, as is often the case
15、.她迟到了，这是经常的事。(先行词是整个主句) (2) To shut your eyes to facts, as many of you do, is foolish.对事实视而不见-你们好多人都是如此的愚蠢。(先行词是不定式短语) 三、as作介词的用法 as作介词，意思是作为，以身份。例如： He came to China as a tourist five years ago.他五年前以游客的身份来过中国。 四、as作副词的用法 to the same degree or amount; equally 相同地，同样地。例如： They dont have as many airplanes.他们没有同样多的飞机。专心-专注-专业