Skill 25: Use parallel structure with paired conjunctions

The paired conjunctions both... and, either....or, neither...nor, and not only...but also require parallel structures.

I know both where you went and what you did.
Either Mark or Sue has the book.
The tickets are neither in my pocket nor in my purse.
He is not only an excellent student but also an outstanding athlete.

PARALLEL STRUCTURE WITH PAIRED CONJUNCTIONS

both (same struture) and (same structure)
either or
neither nor
not only but also