题目内容
【题目】He did the cleaning yesterday.（改为否定句）
He the cleaning yesterday.
【答案】didn't；do
【解析】句意：他昨天打扫卫生了。did是do的过去式，为实义动词，变否定句时须借助didn't，后跟动词原形，所以答案是(1). Didn't (2). do。
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题目内容
【题目】He did the cleaning yesterday.（改为否定句）
He the cleaning yesterday.
【答案】didn't；do
【解析】句意：他昨天打扫卫生了。did是do的过去式，为实义动词，变否定句时须借助didn't，后跟动词原形，所以答案是(1). Didn't (2). do。