根据要求改写句子。
1. My sister wants to learn a new song. (对画线部分进行提问)
2. I always like to dance. (以主语第三人称改写句子)
3. He knew that. (改成否定句)
4. I go to see my grandmother. (改成现在进行时的句子)
5. Jenny can play the piano. (改为否定句)
1. Who wants to learn a new song?
2. He / She always likes to dance.
3. He didn't know that.
4. I am going to see my grandmother.
5. Jenny can't play the piano.