1. Susan has eaten a low carb diet for two years.

2. Mark has put on weight 5 kilos since he quit smoking (gain wieght + số cân= put on weight + số cân: tăng bn cân)

3. They have never been to Korea before.

4. This is the first time I have visited this museum.

5. My father hasn't seen my brother for 10 years.

6. The last time Mr. Pike visited his hometown was in 2015.

7. The last time I went to a concert was over a year ago.

8. Mr. Minh began teaching EL in 1999.

Structure : - S+started/began + to V +in + mốc thời gian cụ thể

                = S+ has/have +Ved/Vp2+ since +mốc thời gian cụ thể 

                   - S+started/began + to V+ khoảng thời gian + ago 

                = S+ has/have +Ved/Vp2 + for + khoảng thời gian

                   - S + has/have +not+ Ved/Vp2 + since+mốc thời gian cụ thể 

               = The last time+ S+ Ved/Vp1+ was +in +mốc thời gian cụ thể 

                   - S+ has/have +not +Ved/Vp2 + for + khoảng thời gian

               = The last time+ S+ Ved/Vp1+ was + khoảng thời gian +ago 

                  - This is the first time + S + has/have +Ved/Vp2

               = S + has/have +not /never +Ved/Vp2 +before