按要求句型转换：Mary was riding a bike at that time
题目
按要求句型转换：Mary was riding a bike at that time
否定句____________
一般疑问句
两回答
特殊疑问句
答案
否定句: Mary wasn't riding a bike at that time.
一般疑问句 Was Mary riding a bike at that time?
肯定回答Yes, she was.
否定回答 No, she wasn't .
特殊疑问句: What was Mary doing at that time ?
举一反三
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