shows something belongs to someone
This is the bike of my friend.
这是我朋友的自行车。
shows something is part of something else
She is the manager of the store.
她是这家商店的经理。
shows where someone comes from
The people of this town are friendly.
这个镇上的人们很友好。
shows what something is about
I have a picture of my family.
我有一张我家人的照片。
shows what something is made of
A cup of tea is nice in the morning.
早晨喝一杯茶很不错。
used with amounts and time
We take a walk of thirty minutes every day.
我们每天散步三十分钟。
shows part of a group
Some of the students are late.
有些学生迟到了。
shows where something is
The park is south of the school.
公园在学校南边。
used after action words
The building of the house took one year.
建造这栋房子花了一年时间。
used after some doing words
She dreams of becoming a doctor.
她梦想成为一名医生。
used after feeling words
He is afraid of the dark.
他害怕黑暗。
used to talk about someone's action
It was nice of you to help.
你帮忙真是太好了。
used to describe one thing with another
That fool of a man forgot his keys.
那个傻瓜男人忘了带钥匙。