be made of 用……制成（物理變化,看得出原材料） 例如：be made of wood 由……制成
be made from由……制成（化學(xué)變化,看不出原材料） 例如：The wine is made from grapes. 酒是用葡萄釀造的
be made by 由（人）制成例如： The table was made by the carpenter. 這張桌子是木匠做的.
be made into被制成 例如：The wood was made into desks. 木頭被制成了課桌.
be made up of由……組成 例如：Our class is made up of 45 students.我們班由45名學(xué)生組成.
希望能幫到你,不懂可以再問(wèn).如果木椅是用木塊拼接起來(lái)的，那是用be made of還是 be made up of？？木椅是由木塊組成的，用be made up of