Lesson we took in English

Last last week we learned about the perfect tenses especially the Past Perfect Tense. where the past perfect tense is used to denote earlier of the two past actions. It has two forms which is the ordinary form(where: had + been + past participle of the main verb) and the continuous form (where: had + been + verb -ing). Also the time expressions used in the tense include when, before, by the time, and after. After we discussed, we had many examples and exersices to enhance more our skills about the lesson.