行为动词的一般现在时
主语是第三人称单数的行为动词的一般现在时否定形式是在行为动词的前面加doesn’t（does not）,这时要注意把谓语动词还原为动词原形.
Peter has breakfast every day.
Peter doesn’t have breakfast every day.
Paul plays basketball on Wednesday..
Paul doesn’t play basketball on Wednesday.
2主语是第三人称单数的行为动词的一般现在时疑问式是在句首加助动词does,后面的谓语动词还原为动词原形．其肯定与否定回答用Yes,X does./ No,X doesn’t.
如下面表达方式：
Does X…?
Yes,it does./ No,it doesn’t.
例如：
Does he have breakfast every day
Yes,he does./ No,he doesn’t.
Does he play basketball on Wednesday?
Yes,he does./ No,he doesn’t.
行为动词第三人称单数的 各种句式总结如下：
肯定 否定 疑问 回答
Peter has breakfast every day.Peter doesn’t have breakfast every day.Does Peter have breakfast every day.
Yes,he does./ No,he doesn’t.
he plays basketball on Wednesday?He doesn’t play basketball on Wednesday?Does he play basketball on Wednesday?Yes,he does./ No,he doesn’t.
She lives in the city.She doesn’t live in the city.Does she live in the city?Yes,he does./ No,he doesn’t.
