句型转换。
1. I eat sandwich today. (用yesterday替换today)
I ________ sandwich ________.
2. I am doing my homework. (改成一般疑问句)
________ you doing ________ homework?
3. Li Ming saw Danny yesterday. (改成否定句)
Li Ming ________ ________ Danny yesterday.
4. They went to Beijing by train last Sunday. (对划线部分提问)
________ ________ they ________ to Beijing last Sunday?
5. Danny bought this hat for Kim. (对划线部分提问)
What did Danny ________ for Kim?