[hela]

Dear teachers,

1) Would you please tell me if the following constructions are correct in English ? and if yes, is there a difference between them?

a) It is a long time since I saw you.
b) It has been a long time since I saw you.
c) It was a long time since I saw you.
d) It was a long time since I had seen you. (incorrect ?)

2) Would it be possible for you to give me exercises on that point of grammar?

Thanks a lot,
Hela