=>
6. That car, whose engine is very good, belongs to Mr Clark.
-> whose (sở hữu)
7. Unless she tries her best, she won't pass the exam.
-> unless = if not
8. Nga prefers jogging to running in the morning.
-> prefer Ving to Ving : thích gì hơn
9. It took Thuy 2 hours to make this dress.
-> take time to V : tốn thời gian làm gì
10. You spent more money than me.
-> so sánh hơn more..than
11. A new school will be built next month.
-> bị động will be V3/ed
12. It is not easy to find an apartment in a big city.
-> It's (not) adj to V
13. We have learned English for four years.
-> thì HTHT have/has V3/ed, for + khoảng thời gian
14. Unless you drive carefully, you will cause accident.
-> Unless = if not
15. Although the weather was bad, they had a picnic to the countryside as planned.
-> Although S V = In spite of N/Ving : mặc dù