`1`.The last time I went to the supermarket was three weeks ago

`\rightarrow` The last time + S + Ved / V2 + was + time / timeline : Lần cuối làm gì

`2`.Mary spent two hours travelling to the countryside last week

`\rightarrow` S + spend + time + V-ing : Dành thời gian làm gì

`3`.While we were learning English , the light went out

`\rightarrow` While + S + was / were + V-ing , S + Ved / V2

`=>` Dùng để diễn tả hành động đang xảy ra , hành động xảy ra trong `1` lúc

`\text{# Eternal}`

`1.` The last time I went to the supermarket was three weeks ago.

`-` Cấu trúc: S + haven't/hasn't +VpII + O + for + khoảng thời gian/since + mốc thời gian

`=>` The last time + S + V-ed + O + was + khoảng thời gian + ago/when/in + mốc thời gian 

`2.` Mary spent two hours travelling to the countryside last week. 

`-` Cấu trúc: IT + takes/took + O + time + to V-inf + O

`=>` S + spend(s)/spent + time + V-ing + O

`3.` While we were learning English, the light went out. 

`-` Cấu trúc: While + S +was/were + V-ing + O, S + V-ed + O

`-` Diễn tả một sự việc đang xảy ra thì một sự việc khác chen vào