1.My brother can (弹吉他) very well. 2.Lucy wants to (参加音乐俱乐部) . 3. I can play the piano.(改为否定句) I the piano. 4. They can swim. (改为一般疑问句) they ? 5. I can sing.(对画线部分提问) can you ? 6. 我的哥哥想要加入游泳俱乐部。 .