2nd level - there is / there are

http://www.englishexercises.org/makeagame/viewgame.asp?id=5276

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http://www.englishexercises.org/makeagame/viewgame.asp?id=4586

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http://www.englishexercises.org/makeagame/viewgame.asp?id=5272

(Quizz)

http://www.englishexercises.org/makeagame/viewgame.asp?id=1274

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http://www.englishexercises.org/makeagame/viewgame.asp?id=2920

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http://www.english-room.com/index.php?option=com_wrapper&Itemid=34

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

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http://www.usingenglish.com/quizzes/74.html

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