Perífrasis verbal

Verbal periphrasis

The "perífrasis verbal" in Spanish is a verbal structure formed by:

A conjugated auxiliary verb + an infinitive/a present participle/a past participle

Sometimes these structures have a preposition, a conjunction or a group of words working as connectives after the auxiliary verb and they form part of the whole structure so they cannot be omitted because it either won't make sense or it will change the meaning.