如：I like bread.
I don't like bread.
当主语为第三人称单数时，要用doesn't构成否定句。 如：He ofter plays football.
He doesn't often play football. 一般疑问句：Do( Does ) +主语+动词原形+其它。（句首加助动词do, does） 如：I often play football.
- Do you often play football? - Yes, I do. / No, I don't.
当主语为第三人称单数时，要用does构成一般疑问句。 如：She goes to school by bike.
- Does she go to school by bike? - Yes, she does. / No, she doesn't.
特殊疑问句：疑问词+一般疑问句。 如：She goes to school by bike. How does she go to school? 动词+s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 一般现在时用法专练:
一、 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________do_________ teach_______ 二、用am, is, are 填空
1. I ______ a boy. ______ you a boy? No, I _____ not. 2. The girl______ Jack's sister. 3. The dog _______ tall and fat.
4. The man with big eyes _______ a teacher. 5. ______ your brother in the classroom?
6. Where _____ your mother? She ______ at home. 7. How _______ your father?
8. Mike and Liu Tao ______ at school. 9. Whose dress ______ this? 10. Whose socks ______ they? 11. That ______ my red skirt. 12. Who ______ I?
13.The jeans ______ on the desk. 14.Here ______ a scarf for you.
15. Here ______ some sweaters for you. 16. The black gloves ______ for Su Yang. 17. This pair of gloves ______ for Yang Ling. 18. The two cups of milk _____ for me.