Modal verbs (can, could, should, must)

Modal verbs (can, could, should, must)
Modal verbs (can, could, should, must)
Modal verbs (can, could, should, must)
Modal verbs (can, could, should, must)
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Author's Instructions

Modal verbs: can, could, should, must. Language functions: ability, inability, possibility, impossibility, advice, prohibition, obligation.