$\text{1.}$ She hasn't come back to her hometown for 4 years.

$\text{→}$ The last time + QKD + was = HTHT<phủ định> + for/ since

$\text{2.}$ He has worked as a bank clerk for 3 months.

$\text{→}$ S + started/ began + V-ing = HTHT<bỏ started/ began> + for/ since

$\text{3.}$ We haven't been to Singapore until 5 years ago.

$\text{→}$ Chúng tôi chưa từng đến Singapore cho đến 5 năm trước.

$\text{4.}$ I haven't had my hair cut since November.

$\text{→}$ S + last + QKD = HTHT<phủ định> + for/ since

$\text{5.}$ We haven't called each other for 5 months.

$\text{→}$ như câu 1

$\text{6.}$ We haven't met for a long time.

$\text{→}$ It is + time + since + S + last + QKD = HTHT<phủ định> + for/ since

$\text{7.}$ How long have you had it?

$\text{→}$ When did + S + V? = How long + have/ has + S + V<htht>?

$\text{8.}$ I have never had such a delicious before.

$\text{→}$ This is the first time + QKD + such (a/ an) + N = S + have/ has + never + V<htht> + such (a/ an) + before.

$\text{9.}$ The last time I saw him was 8 days ago.

$\text{→}$ như câu 1

$\text{10.}$ It is 4 days since I last took a bath.

$\text{→}$ như câu 6

1. She hasn’t come back to her hometown for 4 years
2. He has worked as a bank clerk for 3 months

S have/has VPII for ktg
3. We have not flown to Singapore for 5 years
4. I haven’t had my hair cut since November
5. We haven’t called each other for 5 months
6. We haven’t met for a long time
7. How you have you had it
8. I have never had such a delicious meal
9. The last time I saw him was 8 days ago
10. It is 3 days since I last took a bath