6.We started working here three years ago. ->We have worked here for three years

7.He last had his eyes tested ten months ago. ->He hasn't had his eyes tested for ten months

8.They last visited me five years ago. ->They have not visited me for five years

9.John began playing the piano 10 years ago. -> John has played the piano for 10 years

10.The last time I saw her was a week ago. -> I haven't saw her for a week