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?

【考点】一般过去时，动词过去式,疑问副词,实义动词,助动词,否定句

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