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In English, does "worth" function as an adjective or a preposition? Why is the word followed by a V-ing form? (This book is worth reading.)

Thanks for responding to my question!!

Re: "worth+V-ing"

This book is worth reading.

"Worth" is an adjective here. Adjectives generally cannot have -ing clauses as complement. But "worth" is an exception. Consider also:

It's an idea worth considering.
His story is worth checking out.

Note that "worth" can also be a noun in examples like A dollar's worth of chocolates and You should make an estimate of your net worth.

But "worth" is never a preposition.


Re: "worth+V-ing"

Thank you, Paul!