肯定句和否定句专项练习

肯定句和否定句专项练习

一、 肯定句

1、含有be动词的肯定句

将be动词（is、am、are 如果是过去时态，则is、am过去式为was，are过去式为were）放在主语后构成含有be动词的肯定句，其中如果是Are you 构成一般疑问句则改为I am。

1、Are you a boy? (改肯定句) I am a boy.

2、Is she going to the post office? (改肯定句) She is going to the post office.

3、Are they watching TV now? (改肯定句) They are watching TV now.

4、Were you a student? (改肯定句) I was a student.

2、含有动词的肯定句

一般由Do/Does/Did引导一般疑问句改为肯定句，如果由Do引起疑问句，则肯定句中动词用原形，如果用Does引起疑问句，则肯定句中动词加s或者es, 如果用Did引起疑问句，则肯定句中动词用过去式（一般动词过去式在动词后加ed ,不规则过去式除外）

1、Do you go to school on foot? (改肯定句) I go to school on foot.

2、Does she go swimming in the afternoon? (改肯定句) She goes swimming in the afternoon.

3、Does your father like playing football? (改肯定句) My father likes playing football.

4、Did you go fishing yesterday? (改肯定句) I went fishing yesterday.

5、Did Tom clean his room last weekend? (改肯定句) Tom cleaned his room last weekend.

3、含有can、should、must、would等情态动词的肯定句

将句子中can、should、must、would等情态动词放在主语后面，其中主语you 改为I.

1、Can you fly kites? (改肯定句) I can fly kites.

2、Should you do your homework now? (改肯定句) I should do my homework now.