VERB TO BE AFFIRMATIVE

 

http://www.theyellowpencil.com/ejercicios/imprimirtobe1.html

 

http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-29120.php

 

http://www.members.iinet.net.au/~adelegc/grammar/present_simple/to_be.html