READ, TRANSLATE AND DEFINE THE TENSE FORM.
1) When we came home our parents had already cooked dinner.
2)Helen had cleaned the flat before her sister returned home.
3)By the time we finished the work John had translated the exercise.
4)By 6 o'clock yesterday we had come back from the cinema.
5)Grace was late because she had helped her grandmother about the house.
6)John had been studying psychology for 5 years before he began to work.
7)Carol gad working as a freelancer from home since last year before she changed her job.
8)How long had Bob been working as an accountant before he got a promotion?
9)Mary had been working overtime for two months before she went on business trip.
10)We had been studying computer science for two years before we began to work as graphic designers.