1)My mother has just cleaned the floor so it is very clear now.

2)We have known each other for ten years.

3)I have been an engineer since 2010

4)This is the first time I have tried eating a live octopus.

5)She has already finished the report

6)I've been to Sapa.

7)She has travelled to nearly 20 countries.

8)I've had two glasses of orange today.

9)I haven't decide yet about whether to buy a new bike or a second-hand one.

10)She hasn't phoned yet.

E.g1: I have watched TV for 2 hours
E.g2: It has been 3 months since I first met her
E.g3: My father has worked in this company for 4 yearsE.g5: I can't get into my house because I have lost my keys
E.g4: We haven't met each  other for a long time
E.g5: I haven't eaten this food before
Eg.6: I haven't done my homework yet
E.g7: Have you been in Newyork City?
E.g8: Has she done her homework?
E.g9: Have our parents eaten anything yet?
E.g10: She has lost her keys