Respuesta:
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 Colín have gone to a concert.
Explicación:
El Presente Perfecto. Se construye de la siguiente manera:
Sujeto+ has / have + Verbo en Participio Pasado + Complemento