Jimmy has a toothache.Must he sees a dentist?为什麽see加S是错误的?

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Jimmyhasatoothache.Mustheseesadentist?为什麽see加S是错误的?Jimmyhasatoothache.Mustheseesadentist?为什麽see加S是错误

Jimmy has a toothache.Must he sees a dentist?为什麽see加S是错误的?
Jimmy has a toothache.Must he sees a dentist?为什麽see加S是错误的?

Jimmy has a toothache.Must he sees a dentist?为什麽see加S是错误的?
must 是情态动词
情态动词后面只能用动词原形