EXERCICIS THERE IS/THERE ARE:

http://www.englishexercises.org/makeagame/viewgame.asp?id=4933

http://www.adelescorner.org/grammar/there_is/thereis.html

http://www.agendaweb.org/exercises/grammar/there-is-there-are.htm

http://www.kico4u.de/english/uebungen/5klasse/thisare_ex2.htm


EXERCICIS ARTICLES:

http://www.english-4u.de/a_an_ex2.htm

http://www.usingenglish.com/quizzes/302.html

THIS/THESE- THAT/THOSE

http://www.adelescorner.org/grammar/this_that/this_these.html

http://www.adelescorner.org/grammar/this_that/that_those.html

http://www.adelescorner.org/grammar/this_that/this_etc.html