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1、名词变复数与动词变单三的区别一名词变复数。1一般情况下，直接加-s，如：book-books, bag-bags, cat-cats, bed-beds2以s. x. sh. ch结尾，加-es，如：bus-buses, box-boxes, brush-brushes, watch-watches3以y结尾的有两种情况：（1）以“辅音字母+y”结尾，变y为i, 再加-es，如：family-families, strawberry-strawberries（2）以“元音字母+y”结尾，直接加-s如：boy-boys monkey-monkeys4.以“字母o”结尾的名词有两种变化（1）.“辅
2、音字母加o”结尾的名词，有生命的加es；无生命的加如：potato-potatoes tomato-tomatoes zoo-zoos （2）“元音字母+o”结尾的名词，加s：如：bamboo-bamboos5以“f或fe”结尾，变f或fe为v, 再加-es，如：knife-knives wife-wives6不规则名词复数：（1）.单复数一致：fish-fish, people-people, Chinese -Chinese, Japanese-Japanese sheep-sheep（2）.元音字母发生变化：man-men, woman-women, policeman-policeme
3、n, policewoman-policewomen, foot-feet,. tooth-teeth, （3）不规则的：mouse-mice, child-children练习：写出下列各词的复数。I _ him _ this _ her _watch _ book _ child _ photo _ diary _ day_ foot_ dress _tooth_ sheep _ box_ strawberry _ thief _ yo-yo _ peach _ man_sandwich_ woman_ people_二动词三单的变化规则1一般情况下，直接加-s，如：cook-cooks,
4、 milk-milks2以s. x. sh. ch. o结尾，加-es，如：guess-guesses, wash-washes, watch-watches, barushbrushes,go-goes,do-does3以“辅音字母+y”结尾，变y为i, 再加-es，如：study-studies4.不规则变化：如：have_has练习: 写出下列动词的第三人称单数。drink _ go _ stay（停留） _ make _look_ have_ pass（经过）_ carry_come_ watch_ plant（种植）_ fly_study_ brush（刷）_ teach（教）_二动
5、词三单的变化规则1一般情况下，直接加-s，如：cook-cooks, milk-milks2以s. x. sh. ch. o结尾，加-es，如：guess-guesses, wash-washes, watch-watches, barushbrushes,go-goes,do-does3以“辅音字母+y”结尾，变y为i, 再加-es，如：study-studies4.不规则变化：如：have_has练习: 写出下列动词的第三人称单数。drink _ go _ stay（停留） _ make _look_ have_ pass（经过）_ carry_come_ watch_ plant（种植）_ fly_study_ brush（刷）_ teach（教）_