MUST / MUST NOT

MUST / MUST NOT (VERY IMPORTANT OBLIGATION)

Exercícios:

 

http://www.englishexercises.org/makeagame/viewgame.asp?id=2786

 

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-72827.php

 

 

Youtube:

 

http://www.youtube.com/watch?v=pNqSzW9V_Vs

 

http://www.youtube.com/watch?v=-ZqFhzV79yc&feature=related

 

http://www.youtube.com/watch?v=YyfHLO28ylA

 

http://www.youtube.com/watch?v=j8jQpLf1WkY