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

(1)Chinese is spoken as a first language by Chinese in China.

(2)German is spoken as a foreign language in France.

4.分数的用法

(1)One-third of the water is dirty.  (2)Two-thirds of the population are farmers.

(3)A quarter of the boys haven't finished their hpmework.

5.between,among

(1)English is widely used for business between different countries.(强调双边贸易)

(2)China is between Russia,India,Viet Nam and North Korea.（强调两两接壤)

(3)My house is among the trees.