题目内容
12.Tom has already finished his homework.(改为否定句)Tomhasn't finished his homeworkyet.
分析 --汤姆已经做完作业了.
--汤姆还没有完成作业.
解答 答案:hasn't;yet.考查否定句.由has already finished可知是现在完成时态.变否定句直接在助动词has后加not,缩写为hasn't.already变为yet,用于句尾.答案是hasn'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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