行為動詞的變化。
肯定句：主語+動詞原形(+其它)。
否定句：主語+ don't( doesn't ) +動詞原形(+其它)。
如：I like bread. I don't like bread.
當主語為第三人稱單數時，要用doesn't構成否定句。
如：He ofter plays football.
He doesn't often play football.
一般疑問句：Do( Does ) +主語+動詞原形+其它。(句首加助動詞do, does)
如：I often play football.
- Do you often play football?
- Yes, I do. / No, I don't.
當主語為第三人稱單數時，要用does構成一般疑問句。
如：She goes to school by bike.
- Does she go to school by bike?
- Yes, she does. / No, she doesn't.
特殊疑問句：疑問詞+一般疑問句。
如：She goes to school by bike.
Does she go to school by bike?
How does she go to school?
動詞+s的變化規則
1.一般情況下，直接加-s，如：cook-cooks, milk-milks
2.以s. x. sh. ch. o結尾，加-es，如：guess-guesses, wash-washes, watch-watches, go-goes
3.以“輔音字母+y”結尾，變y為i, 再加-es，如：study-studies
