YES - NO QUESTIONS
https://agendaweb.org/exercises/verbs/to-be/short-answers-1
https://agendaweb.org/verbs/tobe-pronouns/index.html
https://agendaweb.org/verbs/to-be-beginners-exercises.html
https://agendaweb.org/verbs/to-be-intermediate-level-exercises.html
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