`1.`I haven't played the violin for 2 years.

`=`It is 2 years since I last played the violin.

`=`I last played the violin 2 years ago.

`2.`The team hasn't won the prize for a long time.

`=`It is a long time since the team last won the prize.

`3.`She hans't done charity work for 2 years.

`=`It is 2 years since she last did charity work.

`=`The last time she did the charity work was 2 years ago.

`4.`I haven't written a letter for 5 years.

`=`I last wrote a letter 5 years ago.

`=`It is 5 years since I last wrote a letter.

`5.`My father hasn't smoked since 2014.

* Giải thích :

+) The last time + S + V2/ed + was + time

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

`=`It is + time + since + S + last + V2/ed

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

+) S + stopped + Ving + time

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