She last phoned me a month ago.

⇒ It is a month since she phoned me.

⇒ The last time she phoned me was a month ago.

⇒ She hasn't phoned me for a month.

Cấu trúc tương đương:

S + last + V(past) + O + time + ago.

= It is + time + since + S + V(past) + O.

= The last time + S + V(past) + O + was + time + ago.

= S + hasn't/haven't + V3/c3 + for + time

She last phoned me a month ago. ( Cấu truc: S + last + V2/ed + thời gian + ago )

`->` It is a month since she last phoned me.

Cấu trúc: = It is + thời gian + since + S + (last) + V2/ed

`->` The last time she phoned me was a month ago.

Cấu trúc: = The last time + S + V2/ed + was + thời gian + ago.

`->` She hasn't phoned me for a month.

Cấu trúc: S + have/has + not + for + khoảng thời gian