Where is your bike?

　　2.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

　　現在進行時

　　1．現在進行時表示現在正在進行或發生的動作，也可表示當前一段時間內的活動或現階段正在進行的動作。（句中一般含有now, look, listen.）

　　2．現在進行時的肯定句基本結構為be+動詞ing.