This is (the way) how I became her boyfriend.
That is (the reason) why I fall in love with her.
I still remember the day when I met her.
This is the park where I met her.
This is what I wanted.
They are the people that want to buy our house.
I have a book which is about Japanese history.
He is the person whom I respect the most.
I know that girl whose name is Nancy.
I have a friend who is from U.S.A.
I'm invited to the party by Tom.
She stopped smoking.
I go to school to study English.
I bought a book to study English.
He stopped to drink coffee.
You're a musician, aren't you?
He is as tall as me.
He is the smartest of three.
I am younger than you.
How long have you been studying Enlgish?
I have been working for 10 years
I have been to Europe.