Did her father do the housework yesterday afternoon?
大部分同学往往会把此句变成“Did her father the housework yesterday afternoon?”原因是没有注意到did在原句中为实意动词，变成问句时，应加上助动词did并将实意动词did归为原形．故正确答案为“Did her father do the housework yesterday afternoon?”
1. That is a black and white cat.(改为复数形式) __________________________________________ 2. Those are big fat pigs. (改为否定句) __________________________________________ 3. They are her trousers. (划线部分提问) __________________________________________ 4. This is an old photo. (改为复数形式) __________________________________________ 5. bag, in, put, your, please, it(连词成句) __________________________________________
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