16/

1/This is the first time I have ever been to Sapa.

2/I haven't seen him since 2010.

3/It is the most amazing sight she has ever seen.

4/The weather in Sydney is not as hot as the weather in Rio.

5/They have lived in New York since 2004.

6/The last time we was in Ha Noi was 3 years ago.

7/Big Ben is the most famous tower in England.

8/New York is more modern than London.

17/

1/They have built this house for 2 months.

2/My father has worked in this factory for 1 week.

3/He has lived in HCM city since he was 8 .

4/He has learned English since he was 18.

5/They began working in that factory 5 years ago.

6/We started learning English 4 years ago.

7/My father has given up smoking since last year.

8/They started working in that factory in 2001

9/Lan didn't write to Maryam 1 month ago.

10/He started living in Ha Noi when he was 12.

11/I didn't meet her a long time ago.

12/How long ago did you start learning French?

13/When did you buy this car?

14/How long have you started listening to classical music?

15/I haven't seen her for 10 years.

18/

1/ We have lived here for 15 years.

2/How long have you begun to learn English?

3/I haven't written a letter to my aunt since May.

4/Mr Minh has begun to collect stamp since 2000.

14/