题目内容
12．Why go to the park with your friends on weekends？（改为否定句）Whynot go to the park with your friends on weekends？
分析 --周末为什么和你的朋友去公园？
--周末为什么不和你的朋友去公园呢？
解答 答案：not go．考查否定句．表示"为什么不"，可以是why not+动词原形．或why don't+sb+动词原形．这里动词原形用go．因此答案是not go．
点评 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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