The past perfect is made with subject + had/hadn’t + past participle. Positive When my parents got to the station, they realised they had left the tickets at home.

The grammar terms (present perfect and past perfect) and the why don’t matter. All you need to know is that the verb form that works with “have” and its cousins is the past participle.

Learning English Grammar Past simple. Up next. Past simple and past continuous. ... Future perfect-ing and -ed (Participle) Clauses. So, such, enough, too. Verb patterns. Future continuous.

Grammar topics include present tenses, the present perfect continuous, the past perfect, zero conditionals, reported speech, relative clauses, passive voice, intensifiers and much, much more.