138 Unit 19 Scusa, non ti avevo visto! È molto che aspetti? Sorry, I didn’t see you. Have you been waiting long? Implied here is something like  (Ora ti ho visto, ma prima) non ti avevo visto  [i.e. I’ve seen you now, but I hadn’t before]. Scusa, non ti  avevo sentito. Sorry, I didn’t hear you. Implied here is something like  Non ti avevo sentito (ma ora ti ho sentito)  [i.e. I hadn’t heard you before, but I have now]. 3 The past perfect in Italian is formed with the imperfect indicative of  avere or  essere  (auxiliary verbs) followed by the past participle of the verb. Here are two examples, one using  avere  and the other  essere : Imperfect of  avere (io)  avevo (tu)  avevi (lui/lei)  aveva (noi)  avevamo (voi)  avevate (loro)  avevano Past participle of  scrivere scritto scritto scritto scritto scritto scritto I had written you had written he/she/it had written we had written you had written they had written Imperfect of  essere (io)  ero (tu)  eri (lui/lei)  era (noi)  eravamo (voi)  eravate (loro)  erano Past participle of  andare andato / andata andato / andata andato / andata andati / andate andati / andate andati / andate I had gone you had gone he/she/it had gone we had gone you had gone they had gone 4 As regards agreement of the past participle, the past perfect obeys exactly the same rules as the present perfect: if the auxiliary is  avere  the past parti- ciple does not change; but if it is  essere  the past participle behaves like an adjective, agreeing in gender and number with the subject of the verb, as in these examples: Avere Livia aveva guardato la televisione. Avevi comprato il pane? Aveva prenotato, Signor Ferro? Livia had watched television. Had you bought the bread? Had you booked, Mr Ferro? Forming the past perfect