http://www.agendaweb.org/verbs/to-be-beginners-exercises.html
http://www.eclecticenglish.com/grammar/PresentSimpleToBe1C.html
https://learnenglishkids.britishcouncil.org/en/grammar-practice/present-simple-verb-be
http://www.eslgamesplus.com/verb-to-be-auxiliary-verb-am-is-are-esl-grammar-activity/
http://www.agendaweb.org/verbs/tobe/
http://www.englishmaven.org/HP6/To_Be_Exercise2.htm
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