TO BE (Present)

Practice what you have learnt:
To be
To be - negative
To be - affirmative
To be - affirmative (2)
To be - affirmative (3)
https://agendaweb.org/verbs/to-be-exercises.html
http://www.eclecticenglish.com/grammar/PresentSimpleToBe1A.html
http://learnenglishkids.britishcouncil.org/en/grammar-practice/present-simple-verb-be
http://mbonillo.xavierre.com/httpdocs/exercises/eso1/1eso2009/bepresent1e5.htm
http://mbonillo.xavierre.com/httpdocs/exercises/eso1/1eso2009/bepresent1e6.htm (questions)
http://mbonillo.xavierre.com/httpdocs/exercises/eso1/1eso2009/bepresent1e7.htm (negative)
http://mbonillo.xavierre.com/httpdocs/exercises/eso1/1eso2010/bepre1eso10.htm (short answers)