What are obligation modals verbs

First activity 

Chech the next videos 

Second activity

Visit the next link :

https://www.slideshare.net/DavidMainwood/modals-for-obligation-and-prohibtion-9128360




Thrird activity

Complete the next exercises 

http://www.englishexercises.org/makeagame/viewgame.asp?id=1859


 http://esl.fis.edu/grammar/multi/modal1.htm


http://s.mound.free.fr/skyblues67/modals/mustn%27t.htm



http://a4esl.org/q/h/0101/ig-modals.html


http://www.curso-ingles.com/practicar/ejercicios/modals-1