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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?