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【题目】They cleaned the room last weekend. (变为否定句)
They the room last weekend.
【答案】didn't；clea
【解析】句子意思是:上周末他们打扫了房间. 这是一般过去时的句子, 句子谓语动词是实义动词cleaned, 变否定句, 应该在谓语动词前加助动词didn't, 谓语动词变成原形. 所以答案是: 1. didn't; 2. clean.
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【题目】They cleaned the room last weekend. (变为否定句)
They the room last weekend.
【答案】didn't；clea
【解析】句子意思是:上周末他们打扫了房间. 这是一般过去时的句子, 句子谓语动词是实义动词cleaned, 变否定句, 应该在谓语动词前加助动词didn't, 谓语动词变成原形. 所以答案是: 1. didn't; 2. clean.