a) Present Simple
1)The metro IS far from my house
2)Mary and Nelly ARE friends
3)It IS10 o'clock. You ARE late for work again
4)The water in the ocean IS salty
5)How old IS Mary?
6)We ARE glad to see them
7)What country IS she from?
8)How much ARE the melons?
9)Many different things ARE made of plastic.
b) Past Simple
1)The door WAS opened
2)These cases WERE very heavy
3)Yesterday we WERE at the theatre
4)Besides him there WERE ten people there
5)My mother WAS 40 yesterday
6)The castle WAS one thousand years old
7)My shoes WERE very dirty
8)The children WERE as quiet as mice
Did you see Jack today?Yes,I saw him at the institute.