El presente progresivo

https://www.quia.com/quiz/438253.html

https://conjuguemos.com/verb/128

http://www2.vmi.edu/academics/modl/bulger-barnettkb/presprog.htm

http://alenord.typepad.com/files/presprogr.htm

http://study.com/academy/practice/quiz-worksheet-present-progressive-tense-in-spanish.html

http://www.learnspanishfeelgood.com/verbs-present-continous1.html