1.     I started working in this hotel six months ago. (worked)

I’ve worked in this hotel for six months.

2.     Sue has been in Italy for the last three weeks. (went)

Sue went to Italy three weeks ago.

3.     I met her during my stay in Paris last summer. (while)

I met her while I was staying in Paris.

4.     We haven’t gone to the cinema for over  a year. (It’s)

It’s over a year since we went to the cinema.

5.     Sam played tennis yesterday and it was his first game. (never)

Sam had never played tennis before (yesterday).

6.     How long is it since they went to Nairobi? (When)

When did they go to Nairobi?