一、倍数增加的表达方法表达 A是B的N倍长(宽、高、大、重等) , A比B长(宽、高、大、重等)N倍 或 A的长度(宽度、高度、大小、重量等)是B的N倍 ,可用下列三种句型。
(一)A +be+倍数+ as +计量形容词原级+ as +B例如:This bed is three times as big as that one.这张床是那张床的三倍大。(比那张大两倍weigh形容词)This tree is three times as tall as that one.这棵树是那棵树的三倍高。(比那棵高两倍)His father is twice as old as he.他父亲的年纪有他两倍大。(比他大一倍)Asia is four times as large as Europe.亚洲的面是欧洲的四倍。(比欧洲大三倍)This big stone is three times as heavy as that one.这块大石头的重量是那块的三倍。(比那块重两倍)The plane flew ten times as high as the kite.那架飞机飞行高度是那个风筝的十倍。(比那个风筝高九倍)
(二)A + be+倍数+计量形容词比较级+than +B例如:The Yangtze River is almost twice longer than the Pearl River.长江差不多比珠江长两倍。(长度是珠江的三倍)This rope is twice longer than that one.这根绳比那根绳长两倍。(长度是那根绳的三倍)This hall is five times bigger than our class room.这个大厅比我们的教室大五倍。(面积是我们教室的六倍)The car runs twice faster than that truck.这辆小车的速度比那辆卡车快两倍。(速度是那
辆卡车的三倍)This book is 3 times longer than that one.这本书的篇幅比那本书长两倍。(篇幅是那本书的三倍)Iron is almost 3 times heavier than aluminum.铁几乎比铝重两倍。(重量几乎是铝的三倍)
(三)A +be+倍数+the+计量名词(如size, height, weigh, length, width等)+ of + B例如:The newly broadened square is four times the size of the previous one.新扩建的广场是未扩建时的四倍大。(比未扩建时大三倍)This street is four times the length of that street这条街是那条街的四倍长。(比那条街长三倍)This hill is four times the height of that small one.这座山的高度是那座小山的四倍。(比那座小山高三倍)This book is 3 times the length of that one.这本书的篇幅比那本书长两倍。(篇幅是那本书的三倍)The earth is 49 times the size of the moon.地球的体积是月球的49倍。(比月球大48倍)This river is three times the depth of that one.这条河是那条河的三倍深。(比那条河深两倍)
(四)increase(+to)+倍数,或increase by+倍数,在这类句型中increase常被rise, grow ,go/step up, multiply等词所替代,表示增加到n倍(或增加n-1倍)例如:The production of steel has increased to three times since 1980.钢的产量1980年以来已增加了两倍。The coal output has increased by five times as against 2000.煤产量比2000年增加了4倍。
比较级comparative degree
在形容词或副词前加more(如 more natural, more clearly )或加后缀 –er (newer ,sooner )
基本句型：
原级比较
  1. 由“．．．as + 形容词 + as．．．”或“．．．as + 形容词 + 名词 + as．．．”构成。
  My grandpa is as energetic as a young man.
  Exercise is as useful a way as any other to lose unwanted weight.
  I try to find as much information as I can about what happened.
  2. 由“．．．not so (as) + 形容词 + as．．．”或“．．．not so (as) + 形容词 + 名词 + as．．．”构成。
  Luckily the weather was not  so wet as it is today.
不同级比较
  1. 由“……形容词比较级 + than．．．”构成。
  He is more concerned about others than about himself.
  2. 由“．．．many / much more + 可数 / 不可数名词 + than．．．”
  My friend earned much more money than I did last year.
特殊句型：
1.表示“越来越……”的意思: “比较级 + and + 比较级”或“more and more / less and less + 原级”结构，与这类结构搭配的常用动词有grow, get, become等。
  She felt herself becoming more and more nervous.
  As the winter is drawing near, it's getting colder and colder.
  2.表示两者之间更···the + 比较级 + of the two + 名词。
  Jane is the taller of the two children in our family.
  3. 表示“越……，越……”:“the + 比较级……，the + 比较级……”，The more magazines you sell, the more money you will get.
　　4. “否定 + 比较级” 相当于最高级。
  — Wait until we get a satisfactory reply, will you?
  — I couldn't agree more. The idea sounds great to me.
  5. “a + 比较级 + 名词（than．．．）” 结构常出现在以never构成的完成时态的动词后面。

  How beautifully she sings！I have never heard a better voice.
　　6. 倍数表示法：．．．times as + 形容词原级 + as．．．；
  ．．．times + 形容词比较级 + than．．．；．．．times the + 性质名词 + of．．．。
  The dining hall is three times as large as that one.
  The dining hall is three times larger than that one.
  The dining hall is three times the size of that one.
英语倒装
1. 完全倒装 
1) 完全倒装即把整个谓语放到主语之前（是整个谓语动词，而非助动词）。    例如：In came the teacher and the class began. （老师走了进来，然后开始上课。）   
2) there引出的完全倒装句：除了最常见的there be句型以外，there还可以接appear, exist, lie, remain, seem to be, stand等，一般都译成"有"的含义，构成完全倒装句。    例如：Th
ere appeared to be a man in black in the distance.（远处有个穿黑衣服的人。）    3) 由地点和时间副词引出的完全倒装句：以地点副词here, there和时间副词now, then 开头，后面的动词是be, come, exist, fall, follow, go, lie, remain, seem, stand等，而主语又是名词时，构成完全倒装句。Up climbed the boy when his mother came.   
4）表示运动方向的副词或地点状语置于句首，谓语表示运动的动词且主语是名词时使用完全倒装    Out rushed a missile from under the bomber. 轰炸机肚底下窜出一枚导弹。    Out he rushed.    注意：   1) 在here, there引出的倒装句中，当主语是普通名词时用完全倒装句，但当主语是代词时，就要用部分倒装句。    例：Here comes the postman!（邮递员终于来了！注意实意谓语动词位于主语之前。）    Here we are.（我们到了。注意系动词位于主语代词之后。）    2) 当主语是代词，谓语是系动词，表语是说明性的词、词组和定语从句时，可以使用完全倒装句，起强调作用。    例：Lucky is he who has been enrolled into a famous university.（他真幸运，被一所名牌大学录取了。）    Typical for China is the crosstalk show where a pair of comedians entertains the audience with word play.（中国典型的是相声表演，两个喜剧演员通过文字游戏逗乐观众

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