题目内容

20．Tom Sawyer had to paint the fence white．（改为否定句）
Tom Sawyerdidn'thaveto paint the fence white．

分析 翻译：汤姆•索亚 必须把栅栏漆成白色．
汤姆•索亚没必要把栅栏漆成白色．

解答 答案：didn't have．句中有had，是have的过去式，因此此句是过去时，一般过去时改否定句，句中没有be动词，添加助动词did+not，缩写为didn't，同时把过去式还原动词的原型have，故答案为didn't have．

点评 本题考查的是一般过去时改否定句，句中没有be动词，添加助动词did，同时把过去式还原动词的原型．

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