Italian past conditional with modals: avrei dovuto, sarei potuto andare

In Italian: Sfumature modali al condizionale passato

avrei dovuto, avrei potuto and avrei voluto carry regret and reproach, and they are how Italians say should have, could have and would have: avrei dovuto studiare di più.

The auxiliary is chosen by the infinitive that follows, not by the modal: sarei potuto andare, because andare takes essere, but avrei potuto mangiare.

The past conditional is also Italian's future in the past, where English uses would: mi disse che sarebbe venuto.