1. Underline the correct alternatives tocomplete the rules?

1. Underline the correct alternatives to complete the rules. Past and Perfect tenses a. We use the past perfect simple / continuous for a completed action that happened before a specific time in the past. B. We use the past perfect simple o continuous to explain the cause of something in the past. We use the past perfect simple / continuous If the cause went on for some time. C. With state verbs (know, be, like, etc. ) we use The past perfect simple / continuous with for or since to say how long an action had been in progress. D. With action verbs, we use the past perfect simple / continuous with for o since to say how long and action had been progress.