be found 后面可以跟形容词吗?

可以.
例如：I find English interesting.改被动：English is found interesting by me.

扩展阅读：be found doing ... have fun doing ... be found in tedious ... be fond of 的用法 ... be found in后面接什么 ... be found all over ... be founded by ... be underfoot to do ... be fond of 后面加什么 ...