Her son used to play the piano．Her sondidn't useto play the piano．题目和参考答案——青夏教育精英家教网—

4．Her son used to play the piano．（改为否定句）
Her sondidn't useto play the piano．

分析她的儿子过去弹钢琴．
她的儿子过去不弹钢琴．

解答答案：didn't use．used to do sth过去常常，否定句是借助于did，后加原形use，故答案是didn't use．

点评 .used to do sth．的否定式有两种形式：
used not （usedn't）to do sth．
didn't use to do sth．例如：
He didn't use to （usedn't to）like country music，but now he is getting interested．

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