`1.`I last visited my parents three months ago.

`2.`She hasn't written to me for three months.

`3.`I haven't eaten this kind of food since January.

`4.`I last saw John two years ago.

`5.`Minh hasn't written to his pen pal for five months.

`6.`This is the first time we have seen this kind of food.

`7.`This is the first time I have eaten this kind of food.

`8.`We haven't met him for age.

`9.`They haven't heard from her for age.

`10.`She used to play tennis better than she does now.

`=>`So sánh hơn với Adv : S1 + V + more Adv + than + S2

- well `->`better than

`11.`I have never visited a more beautiful city before.

`12.`I haven't heard from her for five years.

`13.`I haven't gone for coffee for two years.

`14.`She has worked as a writer for four years.

`15.`I haven't eaten this food before.

`16.`I have learnt English for fifteen years.

`17.`He has studied English for four years.

`@`Form :

`1.` S + started/began + Ving/to V + time

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

`2.` S + last + V2/ed + time ( thời gian trong quá khứ )

`=`The last time + S + V2/ed + was + time

`=`It's + time + since + S ( last ) + V2/ed

`=`Phủ định của hiện tại hoàn thành : S + have/has not + Vpp + since/for + time

`3.` S + have/has never + Vpp + before : Ai chưa từng làm gì trước đây...

`=`S + have/has not + Vpp + before

`=`It/This is the first time + S + have/has + Vpp : Đó là lần đầu tiên ai làm gì...

`-` S + last + Ved / V2 + time / timeline : Lần cuối làm gì

`-` S + have / has + VpII + for time / since timeline : Đã làm bao lâu

`-` S + haven't / hasn't + VpII + for time / since timeline : Đã lâu chưa làm

`-` S + have / has + never + VpII + ( such + a / an + adj + N ) + before 

`-` S + haven't / hasn't + VpII + before

`=>` Chưa từng làm gì trước đây

`-` This is the + first / second / third / ... + time + S + have / has + VpII

`=>` Đây là lần thứ ... đã làm gì ...

`1`.I last visited my parents three months ago

`2`.She hasn't written to me for `3` months

`3`.I haven't eaten this kind of food since January

`4`.I last saw John two years ago

`5`.Minh hasn't written to his pen pal for `5` months

`6`.This is the first time they have seen this kind of film

`7`.This is the first time I have eaten this kind of food

`8`.We haven't met him for ages

`9`.They haven't heard from her for ages

`10`.She used to play tennis better than she does now

`->` `\text{S + used to + V-inf :}` Đã từng

`->` So sánh hơn ( Trạng từ ) :

`=>` S1 + V + adv-er / more adv + than + S2

`->` well ( adv ) `->` better ( SSH ) : tốt

`11`.I haven't heard from her for `5` years

`12`.The last time I played tennis was six years ago

`->` The last time + S + Ved / V2 + was + time / timeline : Lần cuối làm gì

`13`.I haven't gone for coffee for `2` years

`14`.She has worked as a writer for `4` years

`15`.I haven't eaten this food before

`16`.I have learnt English for `15` years

`17`.He has studied English for `4` years

`\text{# TF}`