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18.My brother has lunch at his office every day.(改为否定句)
My brotherdoesn'thavelunch at his office every day.

分析 --我弟弟每天在他的办公室吃午饭.
--我的弟弟每天不在他的办公室吃饭.

解答 答案:doesn't have.考查否定句.every day每天,一般现在时态,含有实义动词,主语是brother单数,变否定句在实义动词前用doesn't.实义动词has变原形have.答案是doesn't have.

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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