3 As we saw in Units 7 and 10, when a direct or indirect object pronoun occurs in a sentence together with a verb in the in fi nitive (usually after  dovere , potere ,  volere  or  sapere ), it can be attached to the in fi nitive. In these sentences, when the main verb is in the present perfect (or any other compound tense) there is no agreement of the past participle, even with direct object pronouns: 2 The rule given above does not apply to  indirect  object pronouns: with these, the past participle of the verb never changes: However, when the direct object pronoun is not attached to the in fi nitive, the past participle must agree with it: Unit 13 95 Signor Belli, chi L’ha invitat a ? Dottor Ranieri, L’abbiamo vist a ieri sera alla televisione. Who invited you, Mr Belli? We saw you on television last night, Dr Ranieri. ‘Hai telefonato a Anna e Sara?’ ‘Sì,  gli  ho telefonat o. ’ Quando è venuta Livia,  le  ho o ff ert o un gelato. Ho parlato con Carla e  le  ho dett o tutto. Non  ci  hanno scritt o. ‘Did you phone Anna and Sara?’ ‘Ye s, I phoned them.’ When Livia came I o ff ered her an ice cream. I spoke to Carla and told her everything. They didn’t write to us. ‘Hai letto tutti i libri?’ ‘Sì, ho dovut o  legger li  tutti.’ Carmen mi ha scritto una lettera, ma non ho ancora potut o legger la. Daniela ha molte compagne di scuola, ma non ha volut o invitar le  alla festa. ‘Avete fatto gli esercizi?’ ‘No, non abbiamo saput o  far li. ’ ‘Did you read all the books?’ ‘Ye s, I had to read all of them.’ Carmen wrote me a letter, but I still haven’t been able to read it. Daniela’s got a lot of school friends, but she didn’t want to/wouldn’t ask them to the party. ‘Did you do the exercises?’ ‘No, we couldn’t/didn’t know how to do them.’ ‘Hai letto tutti i libri?’ ‘Sì,  li  ho dovut i  leggere tutti.’ Carmen mi ha scritto una lettera, ma non  l’ ho ancora potut a  leggere. Daniela ha molte compagne di scuola, ma non  le  ha volut e invitare alla festa. ‘Did you read all the books?’ ‘Ye s, I had to read all of them.’ Carmen wrote me a letter but I still haven’t been able to read it. Daniela’s got a lot of school friends, but she didn’t want to/wouldn’t ask them to the party.