UNIT 3 - OBLIGATION (MUST-HAVE TO)/ NO OBLIGATION (DON´T HAVE TO)/ PROHIBITION (MUSTN´T)/ NECESSITY (NEED TO)

PRACTICE:

http://www.englishpage.com/modals/interactivemodal2.htm

http://www.learnenglish-online.com/grammar/modals/tests/modalobligation.html

https://agendaweb.org/exercises/verbs/modals/must.htm

https://agendaweb.org/exercises/verbs/modals/must-have-not.htm

https://test-english.com/grammar-points/a2/have-to-dont-have-to-must-mustnt/

https://www.autoenglish.org/modalverbs/gr.mustnt.i.htm

http://www.englishpage.com/modals/interactivemodal1.htm

http://www.englishpage.com/modals/interactivemodal8.htm