三单主语+三单动词 行为动词三单变化规则:
1. 一般情况下在动词末尾加“ s”
2. 以s, sh, ch, x, o 结尾的动词，变成动词的三单要加“es”
3. 以辅音字母（除了a, e, i, o, u 以外的字母）加y结尾的动词，变成三单要把y变成i, 再加“ es”
4. 特殊的有：have—has
A. 说出下列动词的第三人称单数形式（spell & read）。
read like
grow dance
go do
wash watch
study cry
have play
B. 用所给词的适当形式填空。
1. My mother often (do) housework at the weekends
2. How (do) Mike (spend) his weekends?
3. How (do) you spend (you) weekends?
4. Sometimes she (wash) clothes.
5. How does your father spend (he ) weekends?
6. She often (go) shopping at the weekends.
7. How (do) Su Yang and Su Hai spend (they) weekends?
8. Mike often (catch) insects in the park.
