$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 each other for a long time

$7. $ How long have you had it?
$8. $ I have never had such a delicious meal
$9. $ The last time I saw him was 8 days ago

$→$ Cấu trúc chung :

$\text{Cấu trúc 1 : }$

$→$ S + last + Ved + time+ ago: Lần cuối cùng làm gì

$=$ S + have/ has +not+ for + time

$=$ It’s + time+ since + S + last + Ved

$=$ The last time + S + V ed+ was + time + ago

$\text{Cấu trúc 2 : }$

$→$ When + QKĐ

$→$ How Long + HTHT

$\text{Cấu trúc 3 : }$

$→$ This is the first time + S +have/has+P2: Lần đầu làm gì

$=$ S +have/ has + never + P2+ before

$=$ S+ have/ has not+ P2+ before

$#Mình là Channn :)))$

`3.` We have flown to Singapore for 5 years

S + has/ have + (not) + V_ed/ V3 + for + khoảng thời gian

`4.` I haven't had my hair cut since November

S + has/ have + (not) + V_ed/ V3 + since + mốc thời gian

`5.` We haven't called each other for 5 months

S + has/ have + (not) + V_ed/ V3 + for + khoảng thời gian

`6.` We haven't met for a long time

S + has/ have + (not) + V_ed/ V3 + for + khoảng thời gian

`7.` How long have you had it?

How long + has/ have + S + V_ed/ V3?

`8.` I have never had such a delicious meal before

S + has/ have + (not/ never) + V_ed/ V3 + before

`9.` The last time I saw him was 8 days ago

The last time + S + V_ed/ V2 + was + khoảng thời gian + ago