Source: Pinterest
(Source) At a glance:
http://englishteachermargarita.blogspot.com/2015/11/i-should-have-known-better.html?m=1
Explanation and exercises (British Council)
https://learnenglish.britishcouncil.org/en/english-grammar/modal-verbs
20 online exercises:
https://agendaweb.org/verbs/modals-exercises.html
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