teach的过去式是

钢琴

taught作为动词：教育；教( teach的过去式和过去分词 )；教书；训练。

例句：1、He taught science and maths.

他教科学和数学这两门课。

2、Their daughter’s death had taught him humility.

他们女儿的死使他学会了谦逊。

3、I taught myself how to play the piano.

我自学了弹钢琴。