Thanh hasn't eaten this kind of food for 3 years.
→It is the first time Thanh has eaten this kind of food
5. Hanh hasn't phone her mother for 5 days.
→It is the first time hanh has phoned her mother
6. Her brother hasn't drive a car before.
→This is the first time her brother has driven a car
7. We have never met such a famous singer before.
→It's the first time we have ever met such a famous singer
8. He has never been to the zoo before.
It's the first time he has ever been to the zoo
9. The hasn't drunk coke before.

10. His father hasn't been in hospital before.
→ It's the fisrst time his father has been in hospital
11. My grandfather began collecting stamps 20 years ago
→ My grandfather's has collected stamps for 20 years
12. The workers have destroyed this building since yesterday (since)
→→> The worker 
13. Alice flew to London for 12 hours.
→ It took alice 12 hours to fly to london
14. I started to write this composition at 8 pm
→ I've written this composition since 8 pm
15. My family has lived in Hue since last month.
→ My family began living in hue last month
16. We started waiting for the bus 15 minutes ago
→ We 've waited for the bus for 15 minutes
17. They began planting trees in the park in August.
→They have planted trees in the park since august
18. My brother has worked in this restaurant since he left his school.
cher
as
→ My brother started working in this restaurent when he left his school
19. Walking in the rain is interesting for me.
It's interesting for me to walk in the rain
20. You should come back home immediately.
-
→ It's
21. We last met each other two months ago.
→ We have met each other for two months