VII.

$2.$ We have bought a new lamp. → S + have/ has + V3

$3.$ We haven't planned our holiday yet. → S + have/ has + not + V3

$4.$ Where have you been? → Wh- + have/ has + S + V3?

$5.$ He has written five letters. → S + have/ has + V3

VIII.

$1.$ She hasn't come back hometown for 4 years. → S + have/ has + not + V3

$2.$ He has worked as a bank clerk for 3 months. → S + have/ has + V3

$3.$ We have not flown to Singapore for 5 years. → S + have/ has + V3

$4.$ I haven't had my hair cut since November. → S + have/ has + not + V3

`VII.`

`2.` have bought

`3.` haven't planned

`4.` have you been

`5.` has written

`VIII.`

`1.` She hasn't come back hometown for 4 years.

`-` The last time + S + V ed+ was + time + ago.

`=>` S + have/ has +not+ for + time

`2.` He has worked as a bank clerk for 3 months. 

`-` S + began / started + to V/ V-ing + time ago 

`=>` S + have/has + P2 / been Ving+ for / since ...

`3.`  We have not flown to Singapore for 5 years.

`-` It’s + time+ since + S + last + Ved.

`=>` S + have/ has +not+ for + time

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

`-` S + last + Ved + time+ ago: Lần cuối cùng làm gì

`=>` S + have/ has +not+ for + time