https://agendaweb.org/verbs/tobe-pronouns/index.html
https://agendaweb.org/exercises/verbs/to-be-forms
https://agendaweb.org/verbs/tobe-present/index.html
http://www.english-room.com/letsgo/p1/p1_isamare_2.htm
https://www.liveworksheets.com/worksheets/en/English_as_a_Second_Language_(ESL)/Verb_to_be/Verb_to_be_eg54ym
https://www.englisch-hilfen.de/en/exercises/structures/contracted_forms_be.htm
http://www.eclecticenglish.com/grammar/PresentSimpleToBe1B.html
https://www.englisch-hilfen.de/en/exercises/structures/contracted_forms_be_negation.htm
http://www.esl-lounge.com/student/grammar/1g8-to-be-positive-or-negative-gap-fill.php
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