Ответ:
1 I…(did) some snowboarding ,while I….(skiing) in Switzerland, but I…
2. (have not try) ice-skating yet.
3.She …. (has had) this coat for only two years now, I don’t know why you… (suggested) buying a new one yesterday.
4. Ever since he …. (met) her two months ago , he….(hasn’t stopped) thinking of her, and he… (keeps asking) everybody about her.
5. I…(had) a splitting headache this morning, so I ….(have taken) three aspirins today.