Ha venido: He has or is come.
A verb that governs an infinitive through a certain preposition, as—
Convenimos en hacerlo: We agreed upon doing it.
should drop the preposition when a finite verb follows.
N.B.—Many such verbs, however, may preserve the preposition even before a finite mood, as—
Convenimos que, or en que, lo hiciesen: We agreed that they should do it.
When the subject of a verb is a collective noun, the verb is placed in the singular (see Lesson XXXII for exception).
When a compound subject follows the verb, this may agree in number and person with the first subject only, as—
Nos ha llegado la circular y los impresos que la acompañaban: We received the circular and the printed matter which accompanied it.
The ambiguity between a Reflexive verb plural and a Reciprocal verb is avoided thus—