shows something belongs to someone
This is the bike of my friend.
これは私の友達の自転車です。
shows something is part of something else
She is the manager of the store.
彼女はその店のマネージャーです。
shows where someone comes from
The people of this town are friendly.
この町の人々は友好的です。
shows what something is about
I have a picture of my family.
私は家族の写真を持っています。
shows what something is made of
A cup of tea is nice in the morning.
朝の一杯のお茶は素敵です。
used with amounts and time
We take a walk of thirty minutes every day.
私たちは毎日30分の散歩をします。
shows part of a group
Some of the students are late.
学生の何人かは遅刻しています。
shows where something is
The park is south of the school.
公園は学校の南にあります。
used after action words
The building of the house took one year.
その家の建設には1年かかりました。
used after some doing words
She dreams of becoming a doctor.
彼女は医者になることを夢見ています。
used after feeling words
He is afraid of the dark.
彼は暗闇を恐れています。
used to talk about someone's action
It was nice of you to help.
手伝ってくれてありがとう。
used to describe one thing with another
That fool of a man forgot his keys.
あの馬鹿な男は鍵を忘れました。