`28` It is Monday since I (last) took a bath 

`29` I have not a punture for 2 years

`30` He has not earned any money for 2 months

`31` He hasn't shaved since the day before yesterday 

`32` I haven't drunk champagne since my brother's wedding

`33` I haven't been in Rome for 2 years

`34` I haven't seen Tom since his wedding day 

- It's + time (trong QK) + since + S + (last) + Ved/V2 + O

-> S + has/have + not + Vpp + for/since + time (trong QK)

- S + last + Ved/V2 + O 

-> S + has/have + not + Vpp + for/since + time (trong QK) 

- S + Ved/V2 + O 

-> S + has/have + Vpp + O