2.行為動詞的變化。

　　否定句：主語+ don't( doesn't ) +動詞原形(+其它)。如：

　　I don't like bread.

　　當(dāng)主語為第三人稱單數(shù)時，要用doesn't構(gòu)成否定句。如：

　　He doesn't often play.

　　一般疑問句：Do( Does ) +主語+動詞原形+其它。如：

　　- Do you often play football?

　　- Yes, I do. / No, I don't.

　　當(dāng)主語為第三人稱單數(shù)時，要用does構(gòu)成一般疑問句。如：

　　- Does she go to work by bike?

　　- Yes, she does. / No, she doesn't.

　　特殊疑問句：疑問詞+一般疑問句。如：How does your father go to work?