He began 【to play】 the piano 【at the age of seven】当他七岁的时候，他开始学习钢琴。 祝你学习进步，更上一层楼！请记得采纳，谢谢！(*^__^*)二楼和三楼的回答都正确，二楼较为规范。he begun to learn the piano at the age of seven.He began to play the piano at the age of seven.to play at the age of sevento play of the age of seven
