Ser means "to be" and is a very common word. How difficult would it be for you to talk without saying "am, are, or is?"
Cyber Profe, tutorial
Cyber Profe, song
Profe Loco, info
Why Not Spanish, info
AIB (until minute 8)
Lightspeed Spanish, song
Senorita Rau, song
http://quizlet.com/14360279/spacerace/ (quizlet: space race)
http://quizlet.com/14360279/scatter/ (quizlet: scatter)
https://www.quia.com/mc/1754215.html (quia: matching)
https://www.quia.com/cm/24147.html (quia: matching)
http://www.quia.com/mc/1775151.html (quia: matching)
http://www.quia.com/cc/1775151.html (quia: concentration)
http://www.quia.com/ws/1775151.html (quia: word search)
http://www.quia.com/cz/88025.html (quia: multiple choice)