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nếu câu trả lời hữu ích nhé!
8. it is 4 years since he started learning english
9. how long have you known her
11. how long has she worked in this company
12. this is the tallest man i have ever seen
13. i haven't eaten such a good meal before
14. she has not got an A in english since last month
15. is this the first time you saw an elephant
16. i haven't taught in BHH school for 3 years
17. it is 6 years since she last travelled by bus
18. this is the tallest man i have ever met
19. she has conducted the survey for 3 days
20. he started writting novel 6 months ago
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