Where is your bike?

　　2.行为动词的变化

　　肯定句：主语+动词原形(+其它)。

　　否定句：主语+ don't( doesn't ) +动词原形(+其它)。

　　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.

　　Does she go 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

　　现在进行时

　　1．现在进行时表示现在正在进行或发生的动作，也可表示当前一段时间内的活动或现阶段正在进行的动作。（句中一般含有now, look, listen.）

　　2．现在进行时的肯定句基本结构为be+动词ing.