ONLINE EXERCISES. MODALS: ABILITY, PERMISSION, ADVICE, OBLIGATION, PROHIBITION AND NECESSITY
Ability and permission:
https://learnenglish.britishcouncil.org/english-grammar-reference/ability
http://usefulenglish.ru/grammar/modal-verbs-exercise-one
https://www.perfect-english-grammar.com/modal-verbs-of-ability-exercise-1.html
https://learnenglish.britishcouncil.org/english-grammar-reference/permission
https://moodle.cendrassos.net/course/view.php?id=361¬ifyeditingon=1
https://learnenglish.britishcouncil.org/english-grammar-reference/requests-offers-and-invitations
http://www.learnenglish-online.com/grammar/modals/tests/modalability.html
https://www.examenglish.com/grammar/A2_can_could.htm
https://agendaweb.org/verbs/modals-must-have-to-exercises.html
Advice:
https://learnenglish.britishcouncil.org/english-grammar-reference/suggestions-and-obligations
https://www.examenglish.com/grammar/A2_ShouldOught.htm
https://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/330-modals-advice1.htm
Obligation:
https://www.perfect-english-grammar.com/modal-verbs-of-obligation-exercise-1.html
http://www.autoenglish.org/modalverbs/ModalsObligation.htm
https://agendaweb.org/verbs/modals-must-have-to-exercises.html
Prohibition:
https://agendaweb.org/verbs/modals-must-have-to-exercises.html
https://www.montsemorales.com/gramatica/ObligProhib.htm
Necessity:
http://www.advanced-english-grammar.com/modal-verbs-of-necessity.html
https://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/330-modals-necessity2.htm
https://www.englisch-hilfen.de/en/exercises/modals/must_not_need_not.htm