1、一. 表达倍数的三个基本句型1.“A+be 动词 /谓语动词+倍数+as+形容词/副词原级+as+B” ，表示“A 正好是 B的多少倍”。例如：Asia is four times as large as Europe.亚洲的面积是欧洲的四倍。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。The plane flew ten times as high as the kite.那架飞机的飞行高度是那只风筝的十倍。2. “A+be 动词 /谓语动词+ 倍数+形容词/副词比较级+than+B”，表示“A 比 B
2、大（长、高、宽等）多少倍”。例如：This rope is twice longer than that one.这根绳子比那根绳子长两倍（是那根绳子三倍长）。This hall is five times bigger than our classroom.这个大厅比我们的教室大五倍(是我们教室的六倍大) 。The car runs twice faster than that truck.这辆小车的速度比那辆卡车快两倍（是那辆卡车的三倍快）。3. “A+be 动词 +倍数+the size/height/length/width, etc+of+B”，表示“A 正好是 B 的多少倍 ”。例
3、如：This street is four times the length of that one.这条街是那条街的四倍长。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。除表达倍数的三个基本句型外，我们还要掌握其基本句型的 7 种变形。1. “ . times as many/much+名词+as+ 被比对象”。例如：There is four times as much water in this pot as in that one.这个壶里装的水是那个壶里的四倍。There are six tim
4、es as many students as we expected.学生数量是我们预期的六倍。2. “ . times+more+名词（可数或不可数）+than+被比对象”。例如：There are five times more books in our library than in yours.我们图书馆里的书比你们图书馆多五倍多。We have produced twice more grain this year than we did last year.我们今年生产的粮食是去年的两倍多。3.“ . times+over+被比对象”。例如：The grain output in
5、that village is twice over that of 2002.那个村的粮食产量是 2002 年的两倍多。4. “ . times+that+of+被比对象 ”。例如：In this workshop, the output of July was 4.5 times that of January.这个车间 7 月份的产量是 1 月份的 4.5 倍。5. “.times+compared with+被比对象”。例如：The number of the students in our school has increased 4 times compared with 1980
6、.我们学校的学生人数比 1980 年增加了四倍。6. “.times+what+从句”。例如：The production is now three times what it was ten years ago.现在的产量是十年前的三倍。二. 用 double 表示倍数 1. double 用作形容词，表示“两倍的”。例如：The production is now double what it was ten years ago.现在的产量是十年前的两倍。2. double 用作动词，表示“是 的两倍。例如：The output has been doubled in the past six years.在过去六年中产量已经翻了一番。This brought a steady rise in the grain yield. In 2002 it nearly doubled that of 1980.这使粮食产量不断增长。到 2002 年产量已经比 1980 年将近翻了两番。
