1.
I usually wear a cap.
2. This is a house.
3. This is Tom's house.
4.
Is this Mary's house? — No, it isn't Mary's house, it's my house.
5. Mike has a brother. His brother is a doctor.
6. Give
me a pen. This pen is bad. Give me another pen.
7. My father usually smokes cigarettes, not a pipe.