Present Continuous Explanation
https://www.aprenderinglesfacil.es/2008/03/presente-continuo-o-progresivo.html
www.aprende-gratis.com/ingles/curso.php?lec=presente-continuo
Present Continuous Exercises- Affirmative
www.ego4u.com/en/cram-up/grammar/present-progressive/form/exercises
www.englishexercises.org/makeagame/viewgame.asp?id=983
web2.uvcs.uvic.ca/elc/studyzone/330/grammar/pcont1.htm
www.juntadeandalucia.es/averroes/torredelprado/ingles/presentcont1.htm
teacher.schule.at/tom-schoftner/drw_files/modal_verbs_is_are_am.htm
Present Continuous- Negative/ Interrogative
oud.digischool.nl/en/grammar/hotpot/presentcont/prescont.htm
www.englishexercises.org/makeagame/viewgame.asp?id=2126
https://www.adelescorner.org/grammar/pres_cont/pres_cont_neg.html
inglesnanet.com/grammar/prescont.htm