1the lesson began five minutes ago
2we sang songs on the concert
3Olga didn't buy a new bag
4Did you go to the theatre last Sunday?
5did your friend invite you on her birthday party?
1the lesson has already begun
2we have just sung on the concert
3Olga hasn't bought a new bag yet
4Have you gone to the theatre this week?
5has your friend invited you on her birthday party?
4