题目内容
2．Put a cover over them．（改为否定句）Don'tputa cover over them．
分析 --给他们盖上盖子．
--不要给他们盖上盖子．
解答 答案：Don't； put．考查否定句．原句是祈使句，通常以动词原形开头．否定形式是在句首直接加don't．后跟动词原形put．答案是Don't； put．
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．祈使句在句首加don't．还有其它用法需要牢记．
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