`-` The Jones last had a picnic in the local park three months ago.

`-` The last time the Jones had a picnic in the local park was three months ago.

`-` It's three months since the Jones had a picnic in the local park.

`××××××××××`

`+` S + haven't/hasn't + PII

`=` S + last + Ved.....

`=` The last time S + Ved + was + thời gian + ago

`=` It's + thời gian + since + S + (last) + Ved 

`->` The Jones last had a picnic in the local park three months ago.

`->` The last time the Jones had a picnic in the local park was three months ago.

`->` It's three months since the Jones (last) had a picnic in the local park.

`=>` 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