Do not use a hyphen between predicate adjectives. Predicate adjectives complement the subject of the sentence and come after the verb. The noun comes before the adjectives.
Use a hyphen between compound modifiers. Compound modifiers come before the subject (noun) and modify the subject as a unit.
Examples of predicate adjectives
Examples of compound modifiers
ICMBs can be open access or password protected.
Password-protected ICMBs require callers to enter an authorization code.
