announce
In Italian, the verb 'annunciare' is used to express the action of announcing or making something known. It is a transitive verb, meaning it requires a direct object. For example, 'annunciare una notizia' means 'to announce a piece of news'. The verb is conjugated according to the subject and tense, such as 'io annuncio' (I announce), 'tu annunci' (you announce), 'lui/lei annuncia' (he/she announces), and so on.
I had to announce my departure to the company
This sentence is used when someone has to inform others, in this case a company, about a certain situation, here it is about the speaker's departure. The verb 'annunciare' is being used to express 'announce' or 'inform'.
The mayor is about to announce his decision regarding the project
This phrase is being used when someone is about to publicly make a statement or declaration, here it is the mayor and his decision about a project. 'Annunciare' here means 'announce' or 'declare'.
You have to announce your presence when you enter the class
In this context, 'annunciare' is used to show the act of making others aware of one's presence, specifically when entering a class. It carries the sense of 'announce' or 'make known'.