be made of 用……制成（物理变化,看得出原材料） 例如：be made of wood 由……制成
be made from由……制成（化学变化,看不出原材料） 例如：The wine is made from grapes. 酒是用葡萄酿造的
be made by 由（人）制成例如： The table was made by the carpenter. 这张桌子是木匠做的.
be made into被制成 例如：The wood was made into desks. 木头被制成了课桌.
be made up of由……组成 例如：Our class is made up of 45 students.我们班由45名学生组成.
希望能帮到你,不懂可以再问.如果木椅是用木块拼接起来的，那是用be made of还是 be made up of？？木椅是由木块组成的，用be made up of