一、名词复数规则
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“辅音字母+y”结尾，变y为i, 再加-es，如：family-families, strawberry-strawberries
4．以“f或fe”结尾，变f或fe为v, 再加-es，如：knife-knives
5．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, people-people, Chinese-Chinese, Japanese-Japanese
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______ sandwich ______ man______ woman_______ paper_______ 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, go-goes
3．以“辅音字母+y”结尾，变y为i, 再加-es，如：study-studies
练习: 写出下列动词的第三人称单数。
drink ________ go _______ stay ________ make ________ look _________
have_______ pass_______ carry ____ come________ watch______
plant_______ fly ________ study_______ brush________ teach_______