【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"。故答案为isn't。

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