9.3.1.1.1 the passato prossimo if there is a modal verb

If there is a modal verb and the main verb isn't reflexive, the auxiliary verb to be used (essere / avere) depends exclusively on the main verb. If the main verb is conjugated normally with avere it is conjugated with avere�and if it is conjugated normally with essere it is conjugated with essere. This may seem very logical and it is very logical indeed. (We just mention it for the people who speaks French because in French it is different. If there is a modal verb the conjugation is with avoir regardless which auxiliary very is used normally.)

transitives verbs  
Ho
Hai
Ha
Abbiamo
Avete
Hanno
potuto
voluto
dovuto
ridere (to laugh)
costruire (to construct)
vedere (to see)
scegliere (to choose)
intransitive verbs  
  Sono
Sei
È
Siamo
Siete
Sono
potut(o/a/e/i)
volut(o/a/e/i)
dovut(o/a/e/i)
andare
partire
venire
arrivare

examples  
  Sono dovuto venire.
  Ha potuto vedere.
  Sono voluto venire.

If there is a modal verb and the main verb is reflexive a distinction is to be made. If the reflexive pronoun is in front of the auxiliary verb the verb is conjugated with essere. But if the reflexive pronoun is added to the infinitive (in the case that there is a modal verb there is an infinitive as well) the auxiliary verb to be used depends on the main verb. If the main verb is conjugated normally with avere it must be conjugated withe avere, otherwise with essere.

reflexive pronoun in front of a modal verb (the reflexive pronoun can be dative or accusative)
  Mi
Ti
Si
Ci
Vi
Si
sono
sei
è
siamo
siete
sono
dovut(o/a/e/i)
potut(o/a/e/i)
volut(o/a/e/i)
verbes with accusative
lavare (to wash)  
costruire (to construct)  
vedere (to see)  
scusare (to apologize)  
verbis with dative  
permettere (to allow)  
dare (to give)  

examples  
  Mi sono dovuto costruire una casa. <=> I must have built a house for myself.
  Ci ha voluto dare la sua macchina. <=> He wanted to give us his car. (not reflexive!)
  Ce lo siamo voluto permettere. <=> We wanted to allow it to us.

reflexive pronoun added to the infinitiv
  Ho
Hai
Ha
Abbiamo
Avete
Hanno
potuto
dovuto
voluto
verbs with accusative
lavare (to wash)
mi
ti
si
ci
vi
si
costruire (to built)
vedere (to see)
scusare (to apologize)
verbs with dative
permettere (to allow)
dare (to give)  

examples  
  Ho potuto lavarmi. <=> I could wash myself.
  Hanno dovuto scusarsi. <=> They had to apologize.






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