1)Olga has,2)I have,3)I am,4)Oleg is,5)My friends are,6)You were ,7)Marina was,8)The boys must,9)I will,10)I can,11)I must,12)I was,13)We were
Olga has got a flag
I have got some flags
I am free on monday
Oleg is free on tuesday
My friends are free on friday
You were right
Marina was late
The boys must go
I will meet him at the airport
I can meet him at the airport
I must meet him at the airport
I was at the airport
We were at the airport