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【答案】
1. Chinese years are named after twelve animals.
2. My sister likes to collect dolls when she was six years old.
3. They were not swimming players
4. Why do you like collecting stamps?
5. Did you visit Beijing last Sunday?
【解析】
3. 系动词were后加not构成否定句。
4. 划线部分表示原因,故用why提问。
5. 有实意动词一般过去时态的句子变否定句时在句首加did,动词过去式还原成原形,第一人称变成第二人称。