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The future tense is 'Will bequeath'
"He decided to bequeath all his worldly belongings to his favorite nephew when he died."
I am quite fortunate that my rich mongol uncle decided to bequeath this excellent line of horses to me.
I hereby bequeath these lands unto you, my son.
William decided to bequeath his coin collection to his favorite nephew.
My grandmother promised to bequeath her grandmother's wedding ring to me as her eldest granddaughter.