Here,it is a gerund- noun formed out of verb. Anonymous Is "mastermi n ding' a noun?
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AnonymousIs "masterminding' a noun?
Anonymous'He is widely blamed for masterminding the attacks.'Is "masterminding' a noun?The only verb form you can use after a preposition (for) is the -ing form (masterminding). In this context the -ing word is called a gerund, which is, more or less, a verb transformed into a noun.