oefening: past simple / present perfect
1. Yesterday I stayed / have stayed home because I was ill.
2. The plane arrived / has arrived 20 minutes ago.
3. That dog bit / has bitten me.
4. The child is sick because it ate / has eaten too much chocolate.
5. When he was 24 he became / has become a doctor.
6. I always wanted / have always wanted to be a teacher.
7. Last night I fell / have fallen from the stairs.
8. I knew / have known him for 6 years now.