Word Study and English Grammar / A Primer of Information about Words, Their Relations and Their Uses

by Frederick W. Hamilton

If should not be used in the sense of where or that.

Ilk means "the same" not kind or sort.

Ill is an adverb as well as an adjective. Do not say illy.

In should not be used for into when motion is implied. You ride in a car but you get into it.

Inaugurate should not be used for begin.

Individual should not be used for person.

Inside of should not be used as an expression of time.

Invaluable, meaning "of very great value" should not be confused with valueless, meaning "of no value."

Invite should not be used for invitation.

Kind is not plural. Do not say "These" or "those" kind of things. Kind of should never be followed by the indefinite article. "What kind of man is he?" not "What kind of a man is he?" Kind of or sort of should not be used in the sense of rather or somewhat.