You don’t always need a noun if you know the verb.  E.g.

  ray’ tIr wIyobta’DI’ reH malop.

  We always celebrate after the rice harvest.

  yobtaHvIS vabDot QaH vengHom puqpu’.

  Even the village children help in the harvest.

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Voragh

From: mayqel qunen'oS

And I was wondering for quite some time now, why I don't see anywhere the {yobta'} used on its own.