it can help keep traditions alivehelp后面应该加to do/doing/sb to do,可是为什么这个句子里keep是原型?

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itcanhelpkeeptraditionsalivehelp后面应该加todo/doing/sbtodo,可是为什么这个句子里keep是原型?itcanhelpkeeptraditionsaliv

it can help keep traditions alivehelp后面应该加to do/doing/sb to do,可是为什么这个句子里keep是原型?
it can help keep traditions alive
help后面应该加to do/doing/sb to do,可是为什么这个句子里keep是原型?

it can help keep traditions alivehelp后面应该加to do/doing/sb to do,可是为什么这个句子里keep是原型?
help 后面跟不带to的不定式