Ex.5
study - studied (regular)
do - done (irregular)
love - loved (regular)
go - gone (irregular)
climb - climbed (regular)
try - tried (regular)
think - thought (irregular)
have - had (irregular)
be - been (irregular)
research - researched (regular)
Ex.6
1. I haven't been to Switzerland.
2. Has Jemma tried the gym?
3. You've done lots of adventurous things.
4. We haven't played tennis together.
5. Matt hasn't had skiing lessons.
6. Have you tried paella?
