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

分析 Lisa第一節(jié)課之前做早操．
Lisa第一節(jié)課之前不做早操．

解答 答案：doesn't．原句是含有實意動詞do"做"的一般現(xiàn)在時的肯定句，否定句借助于助動詞do或者does，主語是Lisa三單，故借助于does后加上not，縮寫成doesn't，后加動詞原形do，故答案是doesn't．

點評 本題考查肯定句變否定句，做此類題時，需在句子相對應的助動詞后加not，若動詞為三單或過去時，動詞需還原成原形．

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