1) I was watching horror movie.
2) I was watching my favorite movie.
3) I was studying English last night.
3) Yes, I may focus more in study English.
4) No, I can't. I can calculate well.
5) Yes, you should, becuase you should know about
history of your country.
6) Yes, they must pay money for only your school, becuase It's a duty for them.