I haven't seen Rosa for five years.

`->`  I last saw Rósa 5 years ago 

`->` The last time I saw Rossa was 5 years ago

`->` It is 5 years since  I saw Rosa.

The children haven't gone to the dentist for six months.

`->` The children last went to dentist six months ago .

`->` The last time the children went to the dentist was 6 months ago 

`->` It is 6 months sine The children went to the dentist

Công thức : The last time + S + Verb(ed/PI) +…+ was + khoảng thời gian + ago
`=` S + Last + Verb(ed/PI) + khoảng thời gian + ago
`=` S + have/ has + not + Verb(PII)+…+ for + khoảng thời gian
`=`  It + is + khoảng thời gian + since + S + Verb (ed/ PI)

Đáp án:

I haven't seen Rosa for five years.

--> I last saw Rosa five years ago.

--> The last time I saw Rosa was five years ago .

The children haven't gone to the dentist for six months.

--> The children last went to the dentist six months ago.

--> The last time went to the dentist was six months ago.

* Cấu trúc:

S+ haven’t/hasn’t+V3/V-ed since/ for

=> S+ last+V2/V-ed+ in/ on/ when/...ago

=> The last time+S+V2/V-ed+was+in/on/...ago

CHÚC BẠN HỌC TỐT!!!

#Tiểu Khôn