She could play the violin when she was five这句话是过去时态,为什么动词play没有改为过去分词?have/has/had 后面也是必须接动词原形吗？

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• She could play the violin when she was five这句话是过去时态,为什么动词play没有改为过去分词?have/has/had 后面也是必须接动词原形吗？
• 2.She could play the violin when she was six(改为同义句) She _______ ____ _______She could play the violin when she was six(改为同义句) She _______ ____ _______ play the violin ________ ______ ______ _______six Mario gives up several hour each week to help the disabled people(对划线部分提问)________ ______ _______ Mario ______up each week to help the disabled people I’d like to travel alone(改为同义句)I _____to travel ______ ______.
• he could play the piano well when he was seven years old的同义句he could play the piano well- - - -seven