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Table 1.

PPI, neutral, and NPI modals

PPI modalsNeutral modalsNPI modals
Universal must, should, ought to, to be to have to, need to need 
Existential — can, may — 
PPI modalsNeutral modalsNPI modals
Universal must, should, ought to, to be to have to, need to need 
Existential — can, may — 
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