请问,be used to doing是习惯于,可在这句里为什么是to make?

问题描述:

请问,be used to doing是习惯于,可在这句里为什么是to make?
The wood is used to make desks and chairs

The wood is used to make desks and chairs
这个是被动句
木头被用来做桌子和凳子