问题描述：
Candy used to take a bus to school.(改为一般疑问句） _____Candy ______ ______take a bus to school?
My father used to drink tea after meals.(改为否定句）
My father ______ _______ _______ drink tea after meals.
My father used to drink tea after meals.(改为否定句）
My father ______ _______ _______ drink tea after meals.
问题解答：
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