3．替换造句。示例：I，watch TV

→S1：What are you going to do this evening？

→S2：I'm going to watch TV this evening．

→S1：Are you going to watch TV this evening？

→S2：Yes，I am．

（1）Jack，play volleyball；

（2）we，have an English class；

（3）you，listen to the radio；

（4）who，sing，