Rule 1. First of
all, use the ever suffix when who or whom
can fit into two clauses in the sentence.
Example Give it to whoever/whomever
asks for it first.
Give it to him. He asks for it
first.
Rule 2. Because we
can substitute him and he into both
clauses, we must use the ever suffix. Now, to
determine whether to use whoever or whomever,
here is the rule:
him + he = whoever
him + him = whomever
Therefore, Give it to whoever asks
for it first.
Example We will hire whoever/whomever
you recommend.
We will hire him. You recommend him.
him + him = whomever
Example We will hire whoever/whomever
is most qualified.
We will hire him. He is most qualified.
him + he = whoever