His parents didn't catch his words at once．His wordsweren't caught by his parents at once．题目和参考答案——青夏教育精英家教网——

题目内容

3．His parents didn't catch his words at once．（改为被动语态）
His wordsweren't caught by his parents at once．

分析他的父母没有立刻听到他的话．
他的话没有立刻被他父母听到．

解答答案：weren't caught．原句didn't catch是一般过去时，一般过去时的被动语态的构成是was/were+动词过去分词，catch的过去式是caught，原句是否定式，故在was/were后加上not，根据words为复数，故答案是weren't caught

点评本题考查一般过去时的被动语态，解答本题的关键是掌握其构成was/were+done．

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