2.其它名词复数的规则变化

1) 以y结尾的专有名词，或元音字母+y 结尾的名词变复数时，直接加s变复数。例如：　

　　　 　two Marys　　　　　　　　 the Henrys

　　 monkey---monkeys　　　　　　 holiday---holidays　

2) 以o 结尾的名词，变复数时：

　　 a. 加s，如： photo---photos　　　 piano---pianos

　　　　　 radio---radios　　　　 zoo---zoos；

　　 b. 加es，如：potato--potatoes　　　 tomato--tomatoes

　　 c. 上述a和b两种方法均可，如zero---zeros / zeroes。　

3) 以f或fe 结尾的名词变复数时：

　　 a. 加s，如： belief---beliefs　　　　 roof---roofs

　　　　　 safe---safes　　　　　 gulf---gulfs；

　　 b. 去f,fe 加ves，如：half---halves　

　　　 knife---knives　leaf---leaves　　　 wolf---wolves

　　　 wife---wives　 life---lives　　　　 thief---thieves；

c. 上述a和b两种方法均可，如handkerchief: handkerchiefs / handkerchieves。

1.名词复数的规则变化

　 名词是表示人,事物,地点或抽象概念的名称的词,有专有名词和普通名词之分,还有可数名词与不可数名词之分.

　 CDDDBACACB

9.______ of the buildings were ruined.

a. Three fourth　 b. Three four　　 c. Three-fourths　　 d. Three-four

sult _____ for questions about earthquakes.

a. the six index　 b. index six　 c. sixth index　 d. index numbering six

8.Five hundred yuan a month _____ enough to live on.

a. is　 b. are　 c. is being　 d. has been

7.The moon is about _____ in diameter as diameter as the earth.

a. one-three as large　 b. one three as large　 c. one-third as large　 d. one third as large

6.The population of many Alaskan cities has ______ in the past three years.

a. more than doubled　 b. more doubled than　 c. much than doubled　 d. much doubled than

5.The earth is about ______ as the moon.

a. as fifty time big　 b. fifty times as big　 c. as big fifty time　 d. fifty as times big

4.We have produced ______ this year as we did in 1993.

a. as much cotton twice　　　 b. as twice much cotton

c. much as twice cotton　　　 d. twice as much cotton