高中英語 unit3 science and nature倍數(shù)表達(dá)法小結(jié)課件 牛津譯林版必修5

1、倍數(shù)表達(dá)法小結(jié),一. 由“倍數(shù)+ as +形容詞（副詞）的原形+ as ”結(jié)構(gòu)組成，表示“A是B的……倍”。例如：1.Asia is four times as large as Europe．2. He walks twice as fast as his little son.,二.由“倍數(shù)+as+形容詞+名詞復(fù)數(shù)（不可數(shù)名詞）+as”結(jié)構(gòu)組成，表示“A是B的……倍”。此結(jié)構(gòu)最?？肌氨稊?shù)+ as+much+不可數(shù)名詞+as”

2、和“倍數(shù)+ as+many+復(fù)數(shù)名詞+as”兩種用法。例： The workers have produced twice as much cotton this year as they did two years ago. 2. The library of our school has six times as many books as theirs.,三. 由“倍數(shù)+as +形容詞+a (an)+名詞單數(shù)+as” 結(jié)構(gòu)組成

3、，表示“A是B的……倍”。例如：1. The boss provided Jim with four times as big an apartment as yours. 2. This is two hundred times as expensive a car as a bike.,四. 由“倍數(shù)+形容詞（副詞）比較級+than”結(jié)構(gòu)組成，表示“A比B大或重等幾倍”。例如：The Yangtze River is a

4、lmost twice longer than the Pearl River. The car runs twice faster than that truck．,五. 由“倍數(shù)+ the size（length, width, height, weight, age, amount，…）of”結(jié)構(gòu)組成，表示“A是B的幾倍大?。ㄩL短；數(shù)量等）”。此類結(jié)構(gòu)中一定要注意不要漏掉名詞前的the。例： The earth is for

5、th-nine times the size of the moon. This hill is four times the height of that small one．,六.由“倍數(shù)+what 從句”結(jié)構(gòu)組成，表示“A是B的……倍”。例如： The length of the road is twice what it was last year. 2. The grain output is three times