thelast time they visited singapore was 3 yers ago

The last time they visited Singapore was 3 years ago.

`->` They haven't visited Singapore for 3 years.

`-` Cấu trúc :

The last time + S + V2 + O + was + \(\left[ \begin{array}{l}K'TG+ago\\When+S+V2\\in+ năm QK\end{array} \right.\) 

`=>`S + have/has + not + V3 + O + For+K'TG/ Since + năm/ Since + S +V2

`-` Dịch nghĩa : Họ đã không đến thăm Singapore trong 3 năm.

`-` It's 3 years since they last visited Singapore. 

`-` They last visited Singapore 3 years ago

`-` They haven't visited Singapore for 3 years.

`××××××××××××`

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

`=` It + is/has been + thời gian + since + S + last + Ved

`=` S + last + Ved + thời gian + ago

`=` S + hasn't/haven't + P2 + since/for....