Sure, here's the breakdown of the underlined words in each sentence as either subject or predicate:
11. **Sitting on the roof of my house** was a huge black bird.
- Subject: Sitting on the roof of my house
- Predicate: was a huge black bird
12. **After dinner,** I like to have a little sleep in front of the television.
- Subject: I
- Predicate: like to have a little sleep in front of the television
13. **I** always bring my dictionary to class.
- Subject: I
- Predicate: always bring my dictionary to class
14. **You** have a vocabulary test tomorrow.
- Subject: You
- Predicate: have a vocabulary test tomorrow
15. **My friend and I** went shopping.
- Subject: My friend and I
- Predicate: went shopping
16. **At the weekend,** my mother works at a sports club.
- Subject: my mother
- Predicate: works at a sports club
17. **Both my parents** have to work at the weekend.
- Subject: Both my parents
- Predicate: have to work at the weekend
18. **On the way from school to Frankfurt** yesterday afternoon, bus number 21 crashed into a parked car.
- Subject: bus number 21
- Predicate: crashed into a parked car
19. **A student and the bus driver** were injured in the crash.
- Subject: A student and the bus driver
- Predicate: were injured in the crash
20. **In the grammar lesson tomorrow,** you will have a vocabulary test.
- Subject: you
- Predicate: will have a vocabulary test