`1,` We used to talk.

`-` used to + V: đã từng làm gì

`2,` He hasn't gone swimming for 2 months.

`-` The last time + S + Ved/V2 + was + time ở QK

`=` S + haven't/hasn't + Ved/V3 + since/for + time

`3,` It's 2 years since I last met Mary.

`-` S + haven't/hasn't + Ved/V3 + since/for + time

`=` It's + time + since + S + last + Ved/V2

`4,` It's the first time they have gone fishing.

`-` S + haven't/hasn't + Ved/V3 + before

`=` It/This is the first time + S + have/has + Ved/V3

`5,` Despite the cold weather, they go for a walk.

`-` Despite/In spite of + N/N phrase/V-ing, S + V: mặc dù

`6,` She has painted this picture for 2 weeks.

`-` S + started/began + to V/V-ing + time ở QK

`=` S + have/has + Ved/V3 + since/for + time

`7,` He is crazy about playing games.

`-` be crazy about + V-ing: thích làm gì

$\color{#6666FF}{\texttt{for_everyoung10}}$