Paper can be made from wood.为什么要加BE

Paper can be made from wood.为什么要加BE Did paper be made from wood 有语法错误吗? Wood can be made into paper .同义句转换 Wood can be made-----paper and many other kinds of things. IV.介词填空1.Paper can be made ______ wood,bambooand many other The dinner-table is made___________wood,and wood can be made THE paper which is made from wood= THe paper made from wood? The paper is made of wood.为什么? a lot of paper is made from wood这里使用is吗为什么呀 He took de wood from trees and made-----into paper come from后为什么要加be Books are made of paper and paper is made from wood.书是纸制成的,而