For this case we can translate the given model as:
I am in physical education class. I am in the gym.
So, we have:
- I am looking for books for a composition that I have to write.
It is talking in the first person, also books are searched in the library, then we have:
I am looking for books for a composition that I have to write. I'm in the library
The following sentence is:
- My family and I talked all afternoon.
It is spoken in the past, in the plural including the first person, the family is in the home or the house, so we have:
My family and I talked all afternoon. We were in the house.
The following sentence is:
- You watch television with your grandparents.
It is spoken in the present, in the second person. If he/she watches television with his grandparents, then he is at their house.
You watch television with your grandparents. You are at your grandparents' house.
The following sentence is:
The third person is used in the present. Then if you use the computer, Mario is at home.
Mario uses the computer. He's in his house
The last sentence is:
- Mrs. Ramiraz prepares a snack for the students.
The third person is used in the present tense. The students are in the school.
Mrs. Ramiraz prepares a snack for the students. She is at school.
Answer:
Estoy en la biblioteca
Estábamos en la casa
Estás en casa de tus abuelos
Está en su casa
Está en el colegio.