句型转换。

1. She doesn't have lunch at home. (变肯定句)    

    She _____ lunch.

2. My teacher plays basketball. (改一般疑问句)   

    _____ your teacher _____ basketball?

3. We play volleyball.(变成由let 开头的祈使句)

     _____ _____ volleyball.

4. The photos are in the drawer. (划线提问) 

    _____ _____ the photos?

5. W-A-T-C-H, watch. (划线提问)

    _____ _____ you _____ watch?

在△ABC中，已知2a=b+c，sin²A=sinBsinC，试判断△ABC的形状。