Past+Perfect+Simple

__**USE**__

 * It expresses the idea that something happened before another action in the past or before an specific time in the past.
 * Example: I __had never been__ in Germany until last year. She __had read__ the book when she saw the movie.
 * We can use the Past Perfect Simple to show that something started in the past and continued up until another action in the past.
 * Example: By the time I went to visit my grandmother, she __had cooked__ the whole dinner. We __had lived__ in the same house for twenty years before we moved to the new one.


 * Verb "to have" [past simple tense] + past participle [verb_ed when regular; 3rd columnd of the list of irregular verbs when irregular]
 * || Affirmative || Negative || Question ||
 * I/You/He/She/It/We/They || I had cleaned || I had not cleaned || Had I cleaned? ||