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14.Lisa does morning exercises before firt class.(改为否定句)
Lisadoesn't do morning exercises before firt class.

分析 Lisa第一节课之前做早操.
Lisa第一节课之前不做早操.

解答 答案:doesn't.原句是含有实意动词do"做"的一般现在时的肯定句,否定句借助于助动词do或者does,主语是Lisa三单,故借助于does后加上not,缩写成doesn't,后加动词原形do,故答案是doesn't.

点评 本题考查肯定句变否定句,做此类题时,需在句子相对应的助动词后加not,若动词为三单或过去时,动词需还原成原形.

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