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You can indicate that modal verb by adding べき /be ki/ at the end of the plain/positive form of a verb. Yaru (to do) + beki (must/should) = Yarubeki (must do).

You can also inflect the nai-form (negative stem) of a verb by adding 'nakya naranai' or most commonly and in short 'nakya' alone, like:

Yaru (to do) => Yaranai ( will/do/does/etc not do) => minus nai=> Yara (: negative stem of Yaru) + nakya = Yaranakya (must do, have to do)

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14y ago

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