题目内容
11．The neighbours saw and heard something strange last night．（改为否定句）The neighboursdidn't seeor hear anything strange last night．
分析 昨天晚上邻居们看见了和听见了一些奇怪的事情．
昨天晚上邻居们没有看见和听见一些奇怪的事情．
解答 答案：didn't，or． 根据题意要把原句改为否定句，原句为一般过去时，有实意动词saw和heard，改为否定句时需要借助于助动词did的否定形式didn't，肯定句中的and改为否定句时改为or．故答案为：didn't，or．
点评 作答时需要区分句子的时态，掌握动词的过去式和原形之间的变化．
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