present simple/progressive

http://www.englishpage.com/verbpage/presentcontinuous.html
[explanation of present continuous (progressive) tense]

http://www.englisch-hilfen.de/en/grammar/pres_pro.htm
[explanation of present continuous (progressive) tense]


http://www.perfect-english-grammar.com/present-simple.html (Good
explanation of simple present tense)
http://www.englishleap.com/grammar/simple-present-tense (Good charts
showing the form of simple present)
http://www.englishpage.com/verbpage/simplepresent.html (stop at
“Active/Passive)
http://www.englishpage.com/verbpage/types.html (non-action verbs)
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/simcon.htm
(difference between simple present and present progressive ( continuous)
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro (difference between
simple present and present progressive ( continuous)
http://fog.ccsf.edu/~lfried/grammar/present.html (review so far)