`1.` It is last year since she last spoke to him

`2.` It is a long time since they last visited their grandparents

`3.` We haven't met him for two years

`4.` He has moved to this city for three months

`5.` Jack took a bath last Monday

`-` It + tobe + time + since + S + (last) + V2/ed + O: lần cuối ai làm gì khi nào 

`***` HTHT: 

`(+)` S + has/have + V3/ed + O

`(-)` S + has/have + not + V3/ed + O

`(?)` Has/Have + S + V3/ed + O?
`-` QKĐ: 

`+` Verb:
`(+)` S + V2/ed + O
`(-)` S  + didn't +  V_inf + O

`(?)` Did + S +  V_inf + O?