Who versus Whom
Use who or whoever when you can replace the word with he:
He is the candidate who should win. (He should win.)
Give the money to whoever wins. (He wins.)
Use whom or whomever when you can replace the word with him:
He is a candidate whom we can trust. (We can trust him.)
Give the money to whomever the team chooses. (The team chooses him.)

A pronoun and other people Ignore/delete and and the other person/people:
You and I figured out the answer.
The professor asked you and me to read the text.
Everyone except Shequita and me attended the meeting.

Pronouns with between
Remember that between is a preposition, so you always need the object pronouns.
The debate was between her and me OR between him and his professor
Object pronouns are me, him, her, us, them, whom, and whomever.

Pronouns with another noun
Ignore/delete the noun: We women must stick together.
The instructor told us students to sit down.

Possessive Pronouns with Gerunds
Use a possessive pronoun preceding a gerund:
My family is happy about my winning the lottery.
We appreciate your being here to celebrate with us.
Some possessive pronouns are my, his, her, your, their, and our.

Pronouns after than or as
Insert the elliptical/omitted words:
My classmates are much older than I [am].
Joanette is just as qualified for the job as he [is].

Linking Verbs
Use subject pronouns after linking verbs:
The winner of the contest is she.
The subject pronouns are I, she, he, we, they, who, and whoever.
Some linking verbs are am, is, are, was, and were.