小学三年级,四年级,五年级分别应该教授哪些英语语法知识?求有经验的老...答:3.以“辅音字母+y”结尾,变y为i, 再加-es,如:family-families, strawberry-strawberries4.以“f或fe”结尾,变f或fe为v, 再加-es,如:knife-knives5.不规则名词复数:man-men, woman-women, policeman-policemen, policewoman-policewomen, mouse-mice child-children foot-feet,. tooth-teeth fish-fish, ...