Ответ:
1. PP: already, yet, since 5 May, ever, never, for 18 weeks, recently
PS: in 2008, when I was younger, three days ago, last week
2. bought
haven't been
has missed
sent, hasn't answered
have known, went
made
3. How long have you known your English teacher?
I have known my English teacher for ? years.
How long have you liked your favourite band?
I have liked my favourite band for ? years.
4. When did you learn to swim?
I learnt to swim ? years ago.
When did you use a computer for the last time?
I used a computer ? days/hours/minutes ago for the last time.