THERE IS X THERE ARE: GRAMMAR + EXERCISES

http://www.grammar.cl/Present/ThereIsThereAre.htm

http://english-zone.com/verbs/thereisare1.html

http://www.agendaweb.org/grammar/there_is_are-exercises.html

http://a4esl.org/q/h/9807/km-thereisare.html

http://www.eslgold.com/grammar/there_is_are.html