句型转换。1. They have fun. (改为否定句)
2. I'm doing my homework. (对画线部分提问)
3. I think he's a bad singer. (改为一般疑问句)
4. It's a piano. (对画线部分提问)
5. I can play the erhu. (对画线部分提问)
试题答案
1. They don't have fun.
2. What are you doing?
3. Do you think he's a bad singer?
4. What is it?
5. What can you play?