五、倍数表达法
1.Twice (X times)的用法
Twice as many/much …as;
X times adj. than;
X times as adj. as;
Twice +n. /prep.(that); (此类应为有数值意义的名词,见后) Twice +what 从句
注意: more than 与as as 在倍数后都对 A is 2 times larger than B, A is 3 times as
large as B; 但在数字后,只有more than对 A is 20m teller than B
2.用动词表达倍数
Double, triple, quadruple, quintuple, sextuple
sth double sth; sth is doubled; sth double(a.) 注意:
produce double 永远错 以上几个动词可以用主动也可以用被动,但不能和as搭配
a doubling of X 和 doubling X 中的X 不能使具体名词,而应该为有数值意义的词:number, amount, quantity, speed, frequency, rate(of), price, concentration, increase
3.sb be +百分数+ more likely (to do sth) than to do sth (前面的to do 可以省,后面的不能)

