In grammar, accusative and infinitive (also Accusativus cum infinitivo or accusative plus infinitive, frequently abbreviated ACI or A+I) is the name for a syntactic construction first described in Latin and Greek, also found in various forms in other languages such as English and Dutch.
[1] In this construction, the subject of a subordinate clause is put in the accusative or objective case and the verb appears in the infinitive form.
For example, translating the aforementioned example into Latin: Sē here is an accusative reflexive pronoun referring back to the subject of the main verb i.e. Iūlia ; esse is the infinitive "to be."
"[2] In late classical and Medieval Latin, the ACI gradually gave way to a construction with quod with the subjunctive.
This was probably the more common usage in spoken Latin and is the form used consistently in Jerome's Vulgate, which reflects a colloquial style.