rewrite sentences with the same meaning.

`13.` The last time Mary met her aunt was when she was `8` years old.

`14.` They left their homeland `4` years ago.

`15.` I have not spoken to her since `2010.`

`-------------`

`-` The last time + S + Ved/V2 + was in `+` time `+` ago `|` when + clause

`=` S + have/has not + P2 + for `+` time `|` since + clause

`-` It's + time + since + S + Ved/V2

`=` S + Ved/V2 + time + ago

Các công thức đổi HTHT - QKĐ

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 

-------------------------------------------

13. The last time Mary met her aunt was when she was 8 years old.

14. They left their homeland over 4 years ago.

15. I have not spoken to her since 2010.

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