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 he**y 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 times 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 h**e 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 that village is twice over that of 2002.
那个村的粮食产量是的两倍多。
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.
我们学校的学生人数比2024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。到产量已经比2024年将近翻了两番。
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