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) __________________________________________________ |