`1.` I haven't seen Minh for a fortnight.

- S + last + V2(ed/BQT) + ... + khoảng thời gian + ago.

= S + have/has + not + V3(ed/BQT) + ... + for + khoảng thời gian.

`2.` It's two years since Tom last visited his uncle.

- The last time + S + V2(ed/BQT) + ... + khoảng thời gian + ago.

= It's + khoảng thời gian + since + S + (last) + V2(ed/BQT) + ...

`3.` It's three years since we last went to My Son.

- S + last + V2(ed/BQT) + ... + khoảng thời gian + ago.

= S + have/has + not + V3(ed/BQT) + ... + for + khoảng thời gian.

`4.` When did he buy the computer?

- How long is it + since + S + V2(ed/BQT) + O?

= When + did + S + V(inf) + O?

`5.` It's the first time I have talked to the headmaster.

- S + has/have + never + V3(ed/BQT) + ... + before.

= It's the first time + S + has/ have + V3(ed/BQT) + ....

`6.` The last time we went to London was years.

- go to somewhere : đi đến đâu (ở đây chỉ 1 chuyển động rời xa vị trí mà người nói đang ở đó).

- S + has/have + not + V3(ed/BQT) + ... + for + khoảng thời gian.

= The last time + S + V2(ed/BQT) + ... + was + khoảng thời gian.

`7.` We haven't eaten this kind of food since January.

- The last time + S + V2(ed/BQT) + ... + was + mốc thời gian.

= S + have/has + not + V3(ed/BQT) + ... + since + mốc thời gian.

`8.` We have lived here for fifteen years.

- S + started + Ving + ... + khoảng thời gian + ago.

= S + has/have + V3(ed/BQT) + ... + for + khoảng thời gian.

`9.` It's five months since she last visited me.

- The last time + S + V2(ed/BQT) + ... + khoảng thời gian + ago.

= It's + khoảng thời gian + since + S + (last) + V2(ed/BQT) + ...

`10.` We haven't met uncle Tam for three years.

- It's + khoảng thời gian + since + S + (last) + V2(ed/BQT) + ... 

= S + has/have + not + V3(ed/BQT) + ... + for + khoảng thời gian.

`-` It + is / has been + time + since + S + last + Ved / V2 : Đã bao lâu kể từ khi ...

`-` It is the first time + S + have / has + VpII : Lần đầu làm gì

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

`-` S + haven't / hasn't + VpII + since timeline / for time : Chưa làm gì

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

`-` When + did + S + V ? : Từ lúc nào ?

`1`.I haven't seen him for a fortnight

`2`.It's two years since Tom last visited his uncle

`3`.It's three years since we last went to My Son

`4`.When did he buy the computer ?

`5`.It's the first time I have talked to the headmaster 

`6`.The last time we came to London was years ago

`7`.We haven't eaten this kind of food since January

`8`.We have lived here here for `15` years

`9`.It's five months since she last visited me

`10`.We haven't met uncle Tam for `3` years

`\text{# TF}`