??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(fù)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(fù)合名詞變復(fù)數(shù)：以不可數(shù)名詞結(jié)尾的復(fù)合名詞無復(fù)數(shù)形式，如：homework.?
??以man或woman為前綴的復(fù)合名詞變復(fù)數(shù)，前后兩個(gè)名詞都變復(fù)數(shù)，如：manservant→
menservants, woman student women students.?
??其它復(fù)合名詞變復(fù)數(shù)：grown?up→grown?ups, brother?in?law→brothers?in?law, stand
?by→stands?by.?
??9)復(fù)合形容詞做定語時(shí)，其中的名詞保持單數(shù)：a six?year?old boy，a two?hundred?page
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(fù)數(shù)形式，故A，C，D都為錯(cuò)誤選項(xiàng)。正確答案為B。
??1) The university authorities are seriously considering abandoning the
traditional______class.?
??A) fifth minutes
??B) fifty?minutes?
??C) fifty?minute
??D) fifty minute's?
??復(fù)合形容詞用作定語時(shí)，其中的名詞不變復(fù)數(shù)，故B不對。A不能做定語，D應(yīng)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(fù)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(fù)合名詞變復(fù)數(shù)：以不可數(shù)名詞結(jié)尾的復(fù)合名詞無復(fù)數(shù)形式，如：homework.?
??以man或woman為前綴的復(fù)合名詞變復(fù)數(shù)，前后兩個(gè)名詞都變復(fù)數(shù)，如：manservant→
menservants, woman student women students.?
??其它復(fù)合名詞變復(fù)數(shù)：grown?up→grown?ups, brother?in?law→brothers?in?law, stand
?by→stands?by.?
??9)復(fù)合形容詞做定語時(shí)，其中的名詞保持單數(shù)：a six?year?old boy，a two?hundred?page
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(fù)數(shù)形式，故A，C，D都為錯(cuò)誤選項(xiàng)。正確答案為B。
??1) The university authorities are seriously considering abandoning the
traditional______class.?
??A) fifth minutes
??B) fifty?minutes?
??C) fifty?minute
??D) fifty minute's?
??復(fù)合形容詞用作定語時(shí)，其中的名詞不變復(fù)數(shù)，故B不對。A不能做定語，D應(yīng)為fifty minutes'，
正確答案為C。