1. We started working here three years ago.
We’ve worked here **for three years**.

2. This is the first time I've been on a plane.
I **haven't been** on a plane before.

3. That's strange! My pen isn't here!
That's strange! **My pen has** disappeared!

4. Nicky and Jan aren't at this school any more.
Nicky and Jan **have left** this school.

5. I saw a friend of yours a few moments ago.
I **met** a friend of yours.

6. I'm still reading my notes.
I **haven't finished** reading my notes yet.

7. Is this your first visit to South America?
Have **you been** to South America before?

8. Oh no! My wallet is still in the car.
Oh no! I **left** my wallet in the car.

9. It's a long time since we spoke to your sister.
We **haven't spoken** to your sister for a long time.

10. Is Anna still asleep?
Has **she woken** up yet?