题目内容
20.Tom used to play games on his phone.(改为否定句)Tomdidn't use to play games on his phone.
分析 --汤姆过去经常在他的手机上玩游戏.
--汤姆过去不在他的手机上玩游戏.
解答 答案:didn't use.考查否定句.由used过去式,可知应该是一般过去时态,变否定句在实义动词used前用didn't.实义动词used变原形use.答案是didn't use.
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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