a) write a letter to a newspaper (-).
b) ski in the Alps (+).
c) meet a famous person (-).
d) visit the Vatican (+).
e) win a prize (+).
f) sing in public (-).
g) read Dante's Inferno (-).
1. I have never written a letter to a newspaper.
2. I skied in the Alps last winter.
3. I have never met a famous person.
4. I visited the Vatican last summer.
5. I won a prize two weeks ago.
6. I have never sung in public.
7. I haven't read Dante's Inferno yet.