Her mother often hears her play the violin.（改为被动语态）
问题描述：
Her mother often hears her play the violin.（改为被动语态）
______ ______ often ______ ______ play the violin.
答
Her mother often hears her play the violin.（改为被动语态）
She is often heard to play the violin.
【be heard to do sth】表示被听到
要用不定式
被动语态的结构是【助动词+谓语动词+宾语】为什么“mother”这个单词在这里就没有了呢？She isoften heard toplay the violin 因为这是原来句子的主语变成被动后就变成宾语了被动语态是不强调动作的实施者的，即不强调这个宾语的，所以通常省略如果要加的话就用【by mother】放在最后就可以了改后的"she"指的是谁。指代的是前面的【 her】即前面的宾语