11. Nga is the girl who won the race last week.
- Subject: Nga
- Verb: is
- Object: the girl
- Relative clause: who won the race last week

12. Easter is one of the most popular festivals in Europe.
- Subject: Easter
- Verb: is
- Object: one of the most popular festivals
- Prepositional phrase: in Europe

13. The explorer who discovered America was Christopher Columbus.
- Subject: The explorer
- Verb: was
- Object: Christopher Columbus
- Relative clause: who discovered America

14. I finished my homework although I didn't feel well.
- Subject: I
- Verb: finished
- Object: my homework
- Conjunction: although
- Adverbial clause: I didn't feel well

15. We are visiting Ha Long Bay which is in the north of Vietnam.
- Subject: We
- Verb: are visiting
- Object: Ha Long Bay
- Relative clause: which is in the north of Vietnam

16. Even though Bao was sick, he helped his mother with the housework.
- Subject: Bao
- Verb: helped
- Object: his mother
- Conjunction: even though
- Adverbial clause: Bao was sick

17. The man who spoke to me yesterday was very polite.
- Subject: The man
- Verb: was
- Object: very polite
- Relative clause: who spoke to me yesterday

18. Passover is one of the most important celebrations for Jewish people.
- Subject: Passover
- Verb: is
- Object: one of the most important celebrations
- Prepositional phrase: for Jewish people

19. The bus which I take to school every morning is always crowded.
- Subject: The bus
- Verb: is
- Object: always crowded
- Relative clause: which I take to school every morning

20. Tet is a festival which occurs in late January or early February.
- Subject: Tet
- Verb: is
- Object: a festival
- Relative clause: which occurs in late January or early February