It's worth a fortune.
Is worth a preposition in the above?
It's worth a fortune . No, "worth" is an adjective here. It's one of just a very small number of adjectives that require a noun phrase as complement (in this case "a fortune").
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It's worth a fortune.
No, "worth" is an adjective here. It's one of just a very small number of adjectives that require a noun phrase as complement (in this case "a fortune").