题目内容
10．The Blacks are preparing the barbecue outside their house．（改为否定句）The Blacksaren't preparing the barbecue outside their house．
分析 --布莱克一家人正准备在他们家外面烧烤．
--布莱克一家人不准备在他们家外面烧烤．
解答 答案：aren't preparing．考查否定句．含有be动词are的句子变否定句，在are后直接加not，缩写为aren't．其它不变．答案是aren't preparing．
点评 本题考查否定句．通常是在be动词，情态动词后加not．一般现在时态，主语不是第三人称单数用don't，主语是第三人称单数用doesn't．一般过去时态用didn't．还有其它用法需要牢记．
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