I vs. Me
Can vs. May
Then vs. Than
Good Vs. Well
Its Vs. It's
That vs. Which
That vs. Who
Lay vs. Lie
Like vs. As
Who Vs. Whom
Assure, Ensure, Insure
Affect Vs. Effect
Into Vs. In
Either/or, Neither/nor, Both/and
Myself/Herself
Not only, but also
Each Vs. Every