learnt或learned。learn用作不及物动词作“吸取教训”多用于否定句；作及物动词时意为“学习；得知；认识到”。

例句：

1、 She's kicked her drug habit and learned that her life has value.她已经戒了毒，并且认识到了生命可贵。

2、 I learned a lot from him about how to run a band.我从他那里学到了许多关于经营乐队方面的东西。