|As a preposition this phrase means "in addition to" or "besides" and
usually takes a gerund:
She spends time in the laboratory as well as
teaching three classes a week.
As a conjunction, it means "and in
addition" or "and not only" and needs parallel construction:
as well as researches.
A phrase beginning with "as well as" after a
singular subject does not change the singular verb and is often set off
John, as well as Jane, is . . . .