12. Despite Anna's sickness, nobody stayed at home to look after her.

Despite + N / Np / Ving, clause: mặc dù 

13. My sister asked me where I would go after the event the next day.

S + asked + O + Wh + S+ V (lùi thì)

will --> would 

tomorrow --> the next day / the following day

14. Sue, who is my best friend, is very supportive to me.

N (người) + who + V 

15. If you drink when you are driving, you will be fined. 

If 1: If + HTĐ, TLĐ

16. If you drink some medicine, you will get better.

17. Although she had a bad mark, she was very happy.

Although + clause, clause: mặc dù 

18. My mother looks after all the member in my family

take care of = look after: chăm sóc

19. The environment will be more polluted if we continue dumping trash.

20. The computer which was made in Italy is very expensive.

N (vật) + which + V / S+ V

`color{orange}{~LeAiFuRuiHuiBao~}`