题目内容
15．Sometimes，people mistake Yuan Longping for an old farmer．（改为被动语态）Sometimes，Yuan Longpingismistaken for an old farmer by people．
分析 --有时候，人们误以为袁隆平是一个老农民．
--有时候，袁隆平被误以为是一个老农民．
解答 答案：is mistaken．考查被动语态．被动语态通常表示动作的承受者，结构是be动词+动词的过去分词．根据sometimes有时，可知是一般现在时态，主语是Yuan Longping．单数，因此用be动词单数is．mistake的过去分词是mistaken．答案是is mistaken．
点评 被动语态表示主语是动作的承受者，被动语态由"be动词+及物动词的过去分词"构成，be动词的单复数要与主语的单复数保持一致，还要注意时态及过去分词的变法．
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