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As I was studying Peterson’s Master TOEFL Writing Skill, I saw the sentence:
Teamwork requires that a player pass the ball whoever is in the best position to make the goal.
I wonder why pass does not take an -es suffix in the sentence cited above. Is it a mistake? If not, could you please explain under which particular circumstances we don’t add -es suffix to a present tense verb that’s in the third-person singular?