1、 英语名词变复数形式1)单数名词加 s: students, apples, bags, trees, books, brothers. 2)以 s、x、sh、ch 结尾的名词加 es: glasses, boxes, brushes, matches. 3)以辅音字母加 y 结尾的名词，变 y 为 i 加 es: cities, babies, enemies. 4)以 f 或 fe 结尾的名词，多数变 f 为 v 加 es: wives, knives.但有些词只加 s: roofs, proof s, chiefs. 5)以 o 结尾的名词，有些加 es: Negroes, heroes
2、, tomatoes, potatoes.其它加 s: radio s, zoos, pianos, photos. 6)不规则名词：foot feet, goosegeese, toothteeth, childchildren, manme n, womanwomen, sheepsheep, deerdeer, mousemice. 7)某些外来词变复数：datumdata, mediummedia, bacteriumbacteria, curriculumcurricula, criterioncriteria, phenomenonphenomena. ( um/ona) anal
3、ysisanalyses, basisbases, crisis crises, diagnosisdiagnoses.( ises ) 8)复合名词变复数：以不可数名词结尾的复合名词无复数形式，如：homework. 以 man 或 woman 为前缀的复合名词变复数，前后两个名词都变复数，如：manservantmenservants, woman student women students. 其它复合名词变复数：grown upgrown ups, brother in lawbrothers in law, stand bystands by. 9)复合形容词做定语时，其中的名词保持
4、单数：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 是复数形式，故 A，C，D 都为错误选项。正确答案为 B。 1) The university authorities are seriously considering abandoning the traditional_class. A) fifth minutes B) fifty minutes C) fifty minute D) fifty minutes 复合形容词用作定语时，其中的名词不变复数，故 B 不对。A 不能做定语，D 应为 fifty minutes，正确答案为 C。
