Breakdown of Era tardi, perciò ci siamo dovuti sbrigare.
essere
to be
tardi
late
dovere
must
sbrigarsi
to hurry up
Questions & Answers about Era tardi, perciò ci siamo dovuti sbrigare.
Why is the auxiliary siamo used with dovere here instead of abbiamo?
The modal verb dovere normally takes avere as its auxiliary. However, it is paired here with the reflexive verb sbrigarsi (to hurry). Because the reflexive pronoun ci is placed before the conjugated verb, the auxiliary must switch to essere.
Why does the past participle change to dovuti instead of staying dovuto?
Whenever you use essere as the auxiliary in a compound tense like the passato prossimo, the past participle must agree with the subject in gender and number. Since the subject is "we" (noi), the participle becomes the plural dovuti (assuming a masculine or mixed-gender group).
Could I attach ci to the end of the infinitive instead? How would that change the grammar?
Yes, you can drop the final -e of the infinitive and attach the pronoun to form sbrigarci. If you put the pronoun at the end, you must revert to using avere as the auxiliary, and the past participle stops agreeing with the subject. The sentence would then be: perciò abbiamo dovuto sbrigarci. Both versions are perfectly natural and mean the exact same thing.
Why use the imperfect tense (Era) for "It was late" instead of the passato prossimo (È stato)?