1. They are my friends.
2. They are playing football.
3. They are doing homework.
4. They are my parents.
5. They are cleaning the classroom.
6. They are old.
7. They are ready to help others.
8. They are the first people in China who once looked at the earth from the space.
9. They are students.
10. They are beautiful.
11. They are playing basketball.
12. They are going skiing tomorrow.
13. They are gone.
14. They are books.
15. They are pens.
16. They are staffed by volunteers.
17. They are here because of us.
18. They are finely engineered boats.
19. They are skilled.
20. They are committed socialists.
希望这些例句对你有所帮助!