Antes de cada atividade auto-dirigida, há um vídeo explicativo:
TO BE Verb: https://www.youtube.com/watch?v=LH57BAO9K88
Link 1: http://www.agendaweb.org/verbs/to-be-beginners-exercises.html
Link 2: http://www.learnenglishfeelgood.com/verbs-tobe-present1.pdf
Link 3: http://www.esl-lounge.com/level1a/lev1a-to-be-question-answer-match.php