`1.` Sửa đề : This is the first time I have had such a delicious meal.

I haven't had such a delicious meal before.

`-` S + haven't/hasn't + Vpp + ... + before

`=` This is the first time S + have/has  + Vpp + ...

`2.` The last time I received her letters was 8 days ago.

`-` S + haven't/hasn't + Vpp + ... + for/since time

`=` The last time + S + V-ed/c2 + ... + was + time

`3.` We have learnt English for 5 years.

`-` S + started + V-ing + ... + time ago

`=` S + have/has + Vpp + ... + for time

`4.` She started teaching the deaf and mute children to read and write 5 months ago.

`10.` My mum hasn't seen her elder sister since 2020.

`1)`

`to` I haven't had such a delicious meal before

`@` Có this is the first time `to` HTHT

`( + )` S + has/have + Ved/ Cột `2`

`2)` 

`to` The last time I saw him was `8` days ago

`( + )` S + Ved/ Cột `2` was/were + time ( QK)

`3)` 

`to` We have learnt English for five years

`@` Thì HTHT

`4)` 

`to` She started teaching the children in this five months ago

`@` Start + V-ing `=` start to V: bắt đầu làm gì

`5)` 

`to` My mum hasn't seen her ealer sister since `2020`

`@` QKĐ `to` HTHT

`( - )` S+ have/has not + Ved/ Cột `2`

`@` Since + mốc thời gian

`#Ph`