1. It has been ten years since I last went to Ho Chi Minh City.

(The last time+ S+ V2/ Ved+ was+ khoảng thời gian+ ago.

-> It+ was/ has been+ khoảng thời gian+ since+ S+ last+ V2/ Ved)

2. I have never read a more interesting novel than this one.

(Đây là cuốn tiểu thuyết thú vị nhất tôi từng đọc.

-> Tôi chưa bao giờ đọc cuốn tiểu thuyết nào hay hơn cuốn này.

S+ has/ have+ never+ PII+ (a/an)+ adj(so sánh hơn)+ N(s/es)+ than+ this/ these.....)

3. I have not been to Bangkok before.

(This is the first time+ S+ has/ have+ (ever)+ PII

-> S+ have/ has+ not/ never+ PII+ before)

4. I have learnt English for 10 years. / I have been learning English for 10 years.

(S+ started/ began+ to V/ Ving+ khoảng thời gian+ ago.

-> S+ has/ have+ PII/ been Ving + for+ khoảng thời gian)

5. I have not seen him for ages.

(It+ was/ has been+ khoảng thời gian+ since+ S+ last+ V2/ Ved

-> S+ have/ has+ not+ PII+ for+ khoảng thời gian)