题目内容
9．I have received your e-mail already．（ 变为否定句）Ihaven't received your e-mailyet．
分析 --我已经收到你的电子邮件了．
--我还没有收到你的电子邮件．
解答 答案：haven't；yet．考查否定句．根据have received，可知是现在完成时态的形式，变否定句直接在助动词have后加not，缩写为haven't．already否定句中要改为yet已经、还．答案是haven't；yet．
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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