Answer :

`->`Olivia last went to a summer music festival 3 years ago.

`->`The last time Olivia went to a summer music festival was 3 years ago.

`->`It's 3 years since Olivia last went to a summer music festival.

`@`Form :

S + last + V2/ed + time ( thời gian trong quá khứ )

`=`S + have/has not + Vpp + since/for + time

`=`It’s + time + since + S ( last ) + V2/ed

`=`The last time + S + V2/ed + was + time

`-` Olivia last went to a summer music festival 3 years ago.

`->` The last time Olivia went to a summer music festival was 3 years ago.

`->` It's 3 years since Olivia (last) went to a summer music festival.

`=>` Cấu trúc:

`-` S + haven't/hasn't + V3/ed + for + khoảng thời gian

`->` S + last + V2/ed + khoảng thời gian + ago

`->` The last time + S + V2/ed + was + khoảng thời gian + ago

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