They might be able to afford a new car .be able to 能用can替代吗?

问题描述:

They might be able to afford a new car .be able to 能用can替代吗?

可以~~表示有能力

这句里不行吧.
might和can都是情态动词吧.
代替也是用could代替might be able to 吧.