1。be made of/from/by/in
(1)This desk is made of wood.（原材料变化很小）(2)Wine is made from grapes.(原材料变化很大）
(3)The postcard is made by my friend.
(4)China is made in China,do you know?(瓷器是在中国造的，你知道吗？）
2.be used by/for/in/as
(1)Bikes are used widely by Chinese for travelling in China.
(2)Sometimes this straight stick is used as a ruler by the boy.
(3)Stamps are used for sending letters.
注意下面2句话的用法
a.He is used to getting up late.(他习惯晚起）
b.The writing brush is used to write.(毛笔用来写字)(=The writing brush is used for writing)
3.be spoken by/in/as