Simple present - exercises

http://www.perfect-english-grammar.com/present-simple.html

http://www.grammar.cl/Basic/Adverbs_Frequency.htm

http://www.perfect-english-grammar.com/present-simple-exercise-1.html

http://www.perfect-english-grammar.com/present-simple-exercise-2.html

http://www.perfect-english-grammar.com/present-simple-exercise-3.html

http://www.perfect-english-grammar.com/present-simple-exercise-4.html

http://www.perfect-english-grammar.com/present-simple-exercise-5.html

http://www.perfect-english-grammar.com/present-simple-exercise-6.html