`22.`

`-` They last saw their parents five years ago.

`-` The last time they saw their parents was five years ago.

`-` It's five years since they last saw their parents.

`->` S + last + Ved/V2 + time + ago

`=` S + have/has not + P2 + for + time

`=` The last time + S + Ved/V2 + was + time + ago

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

`23.` I have never lived in such a friendly neighborhood before.

`->` S + have/has + never + P2 + such + a/an + adj + Noun

`=` This is the first time + S + have/has + ever + P2

Các công thức đổi HTHT - QKĐ

Structure 1: 

S + has/have + not + V3/ed + for/since + time 

--> S + last + V2/ed 

--> The last time + S+ V2/ed + was + time 

--> It is / has been + time + since + S+ (last) + V2/ed 

Structure 2: 

S + has/have + not/never + V3/ed + ... before

--> This/It is the first time + S+ has/have+ V3/ed

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22.

- They last saw their parents five years ago.

- The last time they saw their parents was five years ago.

- It is five years since they last saw their parents.

23.

- I have never lived in such a friendly neighborhood before.

`color{orange}{~LeAiFuRuiHuiBao~}`