Помогите пожалуйста нужно слова которые в скобках изменить в Past Perfect(had/hadn't)

1 bought, had seen2 learned, had watched3 phoned, had found4 visited, had read5 had collected6 arrived, had changed7 met, had becomeПодсказка: то событие, которое произошло раньше - в Past Perfect. А то, которое после него или просто позже - в Past Indefinite.