、变化规则
1、一般情况下直接在词尾加s
例：book---books apple---apples
orange--- _______ tiger--- ________________ girl--- _______________
banana--- ________ lemon--- ________ _ pencil
2、以s,x,sh,ch 结尾的单词，加es
例：bus---buses box---boxes fish---fishes beach---beaches
class--- fox--- beach--- watch---
3、以 f 或fe 结尾的单词，把 f 或fe 变成v 加es
例：leaf---leaves
knife--- (刀) wife--- (妻子)
4、以辅音字母加y 结尾的单词，把y 变i 加es
例：fly---flies
butterfly--- ______ library---_________ baby--- _________ puppy--- ________
二、选择单词的适当形式填空，写在横线上。

1. It ' s so hot. I want to eat an ________ . Do you like ____ ?(-cicr e am, ice creams)
2. ___________________ There are many ____________________ (animal,animals) in the zoo.I like _____________ .( giraffe,giraffes)
3. ---Can I help you? ---Three ____ (doll, dolls),please.
4. I like __________ ( strawberry, strawberries) because they are sweet and juicy.
5. I don 't like _____ (fly, flys,flies) because they are ugly and dirty( 脏的).
6. Look at the _____ (baby,babys,babies). They are so cute.
7. I like ______ (water,waters) because we drink water everyday.
8. These ________ (boy,boys,boies) like _______ .( monkey,monkeys,monkeies)
9. ______________ Brush your (tooth,teeth),Kitty. It ' s time for bed.
三、有些单词就像孙悟空一样会变身，你知道他们是怎么变得吗？现在看看这些变身后的单词，你能把他变身以前的样子写出来吗？
lions--- _____ strawberries--- ____________ roses--- _____________
teeth--- ______ dragonflies--- pears--- _________。