题目内容
19．Tom has already finished writing his first novel．（改为否定句）Tomhasn't finished writing his first novelyet．
分析 --汤姆已经写完了他的第一部小说．
--汤姆还没有写完他的第一部小说．
解答 答案：hasn't；yet．考查否定句．根据has finished可知是现在完成时态，变否定句助动词has后直接加not，缩写为hasn't．already要改为yet，放在句尾．答案是hasn't；yet．
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．还有其它用法需要牢记．
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