I often hear him play the violin.
hear作为行为动词听见时，hear sb do sth表示“听到某人做了某事”或“经常听到某人做某事”，hear sb doing sth.表示“听到某人正在做某事”
I often listen to him play the violin.
I listen to him 主谓宾
often 副词修饰谓语
play the violin 宾语补足语
I often hear him play his violin
I often heard him playing the violin
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