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Y ou often use the past perfect and past perfect continuous tenses when you are talking about the past and you are concerned with something which happened at an earlier time, or which had started at an earlier time but was still continuing.
I had heard it was a good film so we decided to go and see it.
T he past tenses have special meanings in conditional clauses and when referring to hypothetical and imaginary situations, for example after ‘I wish’ or ‘What if …?’. You use the past simple and the past continuous for something you think is unlikely to happen.