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It should be hyphenated when it's used as an adjective.
"Fired up" is one of those phrases that is hyphenated when it is used as a modifier preceding whatever it is modifying, but not hyphenated when it is used as a predicate adjective. For example, if you say "Everyone was fired up about the new project", "fired up" is a predicate adjective and not hyphenated. However, if you refer to someone's "fired-up speech", "fired-up" is a modifier that precedes "speech" and is therefore hyphenated. Using "fired up" as a predicate adjective is more common.
It should be hyphenated if used as a noun clause, but not if used as an adjective
No, "two thirds" should not be hyphenated. It is a compound adjective that functions as a single unit modifying a noun.
It should be hyphenated when it's an adjective.
Yes, "hard worker" should be hyphenated when used as an adjective before a noun, as in "She is a hard-worker."
Any two or three word adjective should be hyphenated ONLY when used as an adjective. Example, "It was his thirty-second birthday." "There was a thirty second delay in rebroadcasting Carl's speech."
It should be hyphenated when it is being used as an adjective.
It should be hyphenated when it's an adjective.
It should be hyphenated if it's being used as an adjective.
The adjective should be hyphenated as "goal-oriented."
"Day-to-day" should be hyphenated when used as an adjective before a noun, such as "day-to-day activities." Otherwise, it can be written as two separate words, "day to day."