1.
I bought this pen. It is (my) pen.
2.
My friend has a guitar. (He/she)is a musician.
3.
She invited Johnny to (her) party.
4.
Children should obey (their) parents.
5.
We hope that (our) life will be happy.
6.
He was (my) teacher, but I don’t remember (him).
7.
Do (you) read the article? Yes, I do. I read it.