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-beds
2．以s. x. sh. ch结尾，加-es，
如：bus-buses, box-boxes, brush-brushes, watch-watches
3．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-monkeys
4.以“字母o”结尾的名词有两种变化
（1）.“辅音字母加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-bamboos
5．以“f或fe”结尾，变f或fe为v, 再加-es，
如：knife-knives wife-wives 6．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-policemen, 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, milk-milks
2．以s. x. sh. ch. o结尾，加-es，
如：guess-guesses, wash-washes, watch-watches, barush—brushes,go-goes,do-does 3．以“辅音字母+y”结尾，变y为i, 再加-es，
如：study-studies
4.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．动词三单的变化规则
1．一般情况下，直接加-s，
如：cook-cooks, milk-milks
2．以s. x. sh. ch. o结尾，加-es，
如：guess-guesses, wash-washes, watch-watches, barush—brushes,go-goes,do-does 3．以“辅音字母+y”结尾，变y为i, 再加-es，
如：study-studies
4.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）________。