Two or more nouns, or nouns and pronouns, in the _singular_ number,
connected by copulative conjunctions, must have verbs, nouns, and
pronouns, agreeing with them in the _plural_; as, "Socrates _and_ Plato
_were_ wise; _they_ were eminent _philosophers_."
NOTE 1. When _each_ or _every_ relates to two or more nominatives in
the singular, although connected by a copulative, the verb must
agree with each of them in the singular; as, "_Every_ leaf, _and
every_ twig, _and every_ drop of water, _teems_ with life."
2. When the singular nominative of a complex sentence, has another
noun joined to it with a preposition, it is customary to put the
verb and pronoun agreeing with it in the singular; as, "Prosperity
with humility, _renders its_ possessor truly amiable;" "The General,
also, in conjunction with the officers, _has_ applied for redress."