Form 8a. Modals

For practicing:

http://www.perfect-english-grammar.com/modal-verbs-of-ability-exercise-1.html;

http://www.perfect-english-grammar.com/modal-verbs-of-obligation-exercise-1.html;

http://www.perfect-english-grammar.com/modal-verbs-of-probability-exercise-1.html;

http://www.perfect-english-grammar.com/modal-verbs-of-probability-exercise-2.html;

https://www.ego4u.com/en/cram-up/grammar/modal-verbs/exercises?02;

https://www.englisch-hilfen.de/en/exercises/modals/form.htm.

QUIZ:
http://www.englishexercises.org/makeagame/viewgame.asp?id=2229#a;
http://esl.fis.edu/grammar/multi/modal1.htm.