1) Karen has sent me an e-mail.
2) Dave and Pat have visited the museum.
3) I have been at the pet shop.
4) They have already packed their rucksacks.
5) Marcus has had an accident.
6) We have done the shopping for our grandmother.
7) I have just cleaned my bike.
8) Emily has painted her room.
9) Lisa and Colin have gone to a concert.
10) My friends have given up smoking.