Maria si è dovuta scusare per il ritardo.

Questions & Answers about Maria si è dovuta scusare per il ritardo.

Why is the auxiliary essere (è) used here instead of avere for the verb dovere?
When a modal verb like dovere (to have to) is followed by a reflexive verb like scusarsi (to apologize), the choice of auxiliary depends on where you put the reflexive pronoun (si). Because si is placed before the conjugated verb, you must use essere.
Why does dovuta end in -a instead of the usual -o?
Whenever you use essere as the auxiliary in the passato prossimo, the past participle must agree with the subject. Since Maria is a single female, the participle changes from dovuto to dovuta.
Is there a way to say this exact same sentence using avere?
Yes! You can attach the reflexive pronoun directly to the end of the infinitive verb. If you do that, the auxiliary switches to avere and the past participle does not change its ending: Maria ha dovuto scusarsi per il ritardo. Both versions are perfectly natural and mean the same thing.
How does scusare mean apologize here?
The regular verb scusare means to excuse, but when used reflexively as scusarsi (literally, to excuse oneself), it means to apologize. In this sentence, the reflexive pronoun si sits before the auxiliary verb, and scusare remains in its infinitive form after the modal verb.
Why is it scusare instead of scusato?
Because it follows the modal verb dovere (dovuta in the past tense). Modal verbs are always followed by the infinitive (the dictionary form) of the second verb.

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