[請益] Until it be thoroguhly finished,文法

[DDayTeam (DDayTeam)]

There must be a beginning of any great matter, but the continuing unto the
end until it be thoroughly finished yields the true glory

這是整個句字,但是搞不懂為什麼until it be這邊

beV為什麼會變成原形?

還請不吝賜教,謝謝

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→ dunchee: (present) subjunctive (我這次也不提供相關資料的 links
→ dunchee: 下次記得給出處/source url link
→ DDayTeam: 這句話是打遊戲時的劇情字幕，出自遊戲Uncharted
→ DDayTeam: 謝謝大大指導