1)單數(shù)名詞加s: students, apples, bags, trees, books, brothers.
2)以s、x、sh、ch結(jié)尾的名詞加es: glasses, boxes, brushes, matches.
3)以輔音字母加y結(jié)尾的名詞，變y為i加es: cities, babies, enemies.4)以f或fe結(jié)尾的名詞，多數(shù)變f為v加es: wives, knives.但有些詞只加s: roofs, proof s, chiefs.
5)以o結(jié)尾的名詞，有些加es: Negroes, heroes, tomatoes, potatoes.其它加s: radio s, zoos, pianos, photos.
6)不規(guī)則名詞：foot→feet, goose→geese, tooth→teeth, child→children, man→me n, woman→women, sheep→sheep, deer→deer, mouse→mice.
7)某些外來詞變復數(shù)：datum→data, medium→media, bacterium→bacteria, curriculum→curricula, criterion→criteria, phenomenon→phenomena. (um/on→a)analysis→analyses, basis→bases, crisis→crises, diagnosis→diagnoses.(is→es )
8)復合名詞變復數(shù)：以不可數(shù)名詞結(jié)尾的復合名詞無復數(shù)形式，如：homework.
以man或woman為前綴的復合名詞變復數(shù)，前后兩個名詞都變復數(shù)，如：manservant→menservants, woman student women students.
其它復合名詞變復數(shù)：grownup→grownups, brotherinlaw→brothersinlaw, standby→standsby.
9)復合形容詞做定語時，其中的名詞保持單數(shù)：a sixyearold boy，a twohundredpage book
【例句】A second doctor must confirm that these criteria ______ and the death must be re ported to the police department.
A) has been met
B) have been met
C) was met
D) was being met
criteria是復數(shù)形式，故A，C，D都為錯誤選項。正確答案為B。
1) The university authorities are seriously considering abandoning the traditional______class.
A) fifth minutes
B) fiftyminutes
C) fiftyminute
D) fifty minute's
復合形容詞用作定語時，其中的名詞不變復數(shù)，故B不對。A不能做定語，D應為fifty minutes'，正確答案為C。
2)以s、x、sh、ch結(jié)尾的名詞加es: glasses, boxes, brushes, matches.
3)以輔音字母加y結(jié)尾的名詞，變y為i加es: cities, babies, enemies.4)以f或fe結(jié)尾的名詞，多數(shù)變f為v加es: wives, knives.但有些詞只加s: roofs, proof s, chiefs.
5)以o結(jié)尾的名詞，有些加es: Negroes, heroes, tomatoes, potatoes.其它加s: radio s, zoos, pianos, photos.
6)不規(guī)則名詞：foot→feet, goose→geese, tooth→teeth, child→children, man→me n, woman→women, sheep→sheep, deer→deer, mouse→mice.
7)某些外來詞變復數(shù)：datum→data, medium→media, bacterium→bacteria, curriculum→curricula, criterion→criteria, phenomenon→phenomena. (um/on→a)analysis→analyses, basis→bases, crisis→crises, diagnosis→diagnoses.(is→es )
8)復合名詞變復數(shù)：以不可數(shù)名詞結(jié)尾的復合名詞無復數(shù)形式，如：homework.
以man或woman為前綴的復合名詞變復數(shù)，前后兩個名詞都變復數(shù)，如：manservant→menservants, woman student women students.
其它復合名詞變復數(shù)：grownup→grownups, brotherinlaw→brothersinlaw, standby→standsby.
9)復合形容詞做定語時，其中的名詞保持單數(shù)：a sixyearold boy，a twohundredpage book
【例句】A second doctor must confirm that these criteria ______ and the death must be re ported to the police department.
A) has been met
B) have been met
C) was met
D) was being met
criteria是復數(shù)形式，故A，C，D都為錯誤選項。正確答案為B。
1) The university authorities are seriously considering abandoning the traditional______class.
A) fifth minutes
B) fiftyminutes
C) fiftyminute
D) fifty minute's
復合形容詞用作定語時，其中的名詞不變復數(shù)，故B不對。A不能做定語，D應為fifty minutes'，正確答案為C。