Verb to be I

http://www.myenglishpages.com/site_php_files/grammar-exercise-be-present.php#.VBeF2flLGew

http://www.englishmaven.org/HP6/To_Be_Exercise2.htm 

http://www.englishmaven.org/HP6/To_Be_Exercise1.htm

http://www.adelescorner.org/grammar/present_simple/to_be.html

Verb to be II

http://www.perfect-english-grammar.com/present-simple-exercise-11.html

http://www.perfect-english-grammar.com/present-simple-exercise-10.html

http://www.perfect-english-grammar.com/present-simple-exercise-12.html 

http://www.perfect-english-grammar.com/present-simple-exercise-13.html

http://www.perfect-english-grammar.com/present-simple-exercise-14.html

http://www.perfect-english-grammar.com/present-simple-exercise-15.html