content_image/814998.jpg content_image/814999.jpg content_image/815000.jpg content_image/815001.jpg
<img src='content_image/814998.jpg'>

2 The rule given above does not apply to indirect  object pronouns: with these, the past participle of the verb never changes: 

<img src='content_image/814999.jpg'>

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: 

<img src='content_image/815000.jpg'>

However, when the direct object pronoun is not attached to the in fi nitive, the past participle must agree with it: 

<img src='content_image/815001.jpg'>

