In Negatives^x, Vocabulary^x, Dates^x

1) Are my sentences correct but with a different meaning? I didn't quite get the nuance between the 2 prepositions. Would you please explain the difference again? a) "The plays had been / were performed THROUG H OUT the next ten years"-- many times /every year in that period b) "He had...

Dear teachers, Would you please help me with the following difficuties? 1) Are my sentences correct but with a different meaning? I didn't quite get the nuance between the 2 prepositions. Would you please explain the difference again? a) "The plays had been / were (?) performed...