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Modal auxiliary verbs are a special type of auxiliary verb, used mainly to express ability, likelihood, permission, and obligation. These include 'will', 'would', 'can', 'could', 'shall', 'should', 'may', 'might', 'must', 'ought', 'need', and 'dare'. Please do not use this tag for the non-modal auxiliaries 'be', 'have', or 'do'.
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Accepted
Using can't / shouldn't for disappointment and must / should for unfulfilled obligation
I would not use You can't have painted the walls green here; it would imply that it is impossible (rather than undesired) that the action occurred, as in doubting a claim that something has occurred. …