You can't normally use off with boast . You can use of , though. Do not boast of your riches.
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AnonymousHe gave me a few rupeesHe gave me a small amount of money.
Anonymoushe gave me few rupeesHe gave me a small number of rupees. (This construction isn't used much nowadays)
AnonymousWhich proposition is used with boast? "To" or "On"To and on are prepositions.
deadrat"Boast" takes the preposition "about."It also takes 'of' in some contexts, as BJ pointed out.
AnonymousWhat is difference between "A few" and just "few"