如果你知道如何弹钢琴，别人会出钱请你教他们。

If you know how to play the piano, this is a skill other people will pay you to teach them.

youdao

他已经忘却如何弹钢琴。

He has forgotten how to play on the piano.

youdao

安德森家太穷了，没有钱请老师来教她如何弹钢琴，所以，她只能自学，弹一些简单的歌曲。

The Andersons were too poor to pay someone to teach Marian. So she was able to teach herself only a few simple songs.

youdao