题目内容

【题目】Sam is going to the supermarket with his mum. (变为否定句)
Sam going to the supermarket with his mum.

【答案】isn't
【解析】句子意思是:Sam打算和他的妈妈一起去超市。要变成否定句,直接在动词is后面加not即可。缩写为"isn't". 所以答案是: isn't.

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