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【答案】1. This is a watch.
2. What is he selling in the store?
3.What do you want?
4. Does he want a bag?
5.Yes, I do.
【解析】
1.此句变为单数句时要将These改为This, are改为is, watches变为a watch. 应为This is a watch.
2.此句的画线部分是things, 所以提问时要用What, 应为What is he selling in the store?
3 此句画线部分是a doll, 所以提问时要用What,另外要将第一人称的I变为第二人称的you. 应为What do you want?
4. 此句变为一般疑问句时要借助于助动词does, 注意第一个字母要大写,后面的动词用原形,应为Does he want a bag?
5.此句做肯定回答时要将第二人称的you变为第一人称的I,应为Yes, I do.