VERB TO BE

VERB TO BE AFFIRMATIVE

http://www.agendaweb.org/verbs/to-be-exercises.html

VERB TO BE NEGATIVE

http://www.agendaweb.org/verbs/to-be-beginners-exercises.html

VERB TO BE INTERROGATIVE

http://www.agendaweb.org/verbs/to-be-lower-intermediate-exercises.html