English File Intermediate (Official Website) https://elt.oup.com/student/englishfile/intermediate3

Modals
Execise 1 (Scroll down to the bottom of the page)
Execise 2 (Scroll down to the bottom of the page)
Execise 3 (must have done etc. - scroll down to see exercises)

Present Perfect
Exercise 1
Exercise 2

for and since
Exercise 1
Exercise 2
Exercise 3

Present Perfect / Past Simple
Exercise 1
Exercise 2
Exercise 3
Exercise 4
Exercise 5
Exercise 6

Present Simple and Present Continuous
http://a4esl.org/q/h/lb/psnv.html
http://a4esl.org/q/h/lb/psv.html
http://www.englishpage.com/verbpage/verbs1.htm
http://www.englishpage.com/verbpage/verbs2.htm
http://www.englisch-hilfen.de/uebungen/zeiten/signalwoerter_present_progressive.htm
http://www.englisch-hilfen.de/uebungen/zeiten/simple_present_progressive.htm
http://www.englisch-hilfen.de/uebungen/zeiten/simple_present_s2.htm

Questions and question words
http://www.englisch-hilfen.de/uebungen/satzstellung/entscheidungsfrage1.htm
http://www.englisch-hilfen.de/uebungen/fragen/simple_present2.htm
http://www.englisch-hilfen.de/uebungen/satzstellung/frage_mit_fragewort1.htm
http://www.englisch-hilfen.de/uebungen/fragen/bilden2.htm

Prepositions:
http://www.englishpage.com/prepositions/prepositions.html

Past Simple and Past Continuous
http://www.englishpage.com/verbpage/simplepast.html
http://www.englishpage.com/verbpage/pastcontinuous.html

Irregular verbs
http://www.english-4u.de/irregular_verbs.htm

Countable, Uncountable, some, any etc.
http://www.oup.com/elt/global/products/headway/elementary/a_grammar/unit05/hwy_elem_unit05_2/
http://www.oup.com/elt/global/products/headway/elementary/a_grammar/unit09/hwy_elem_unit09_3/
http://www.oup.com/elt/global/products/headway/elementary/a_grammar/unit09/hwy_elem_unit09_2/
http://www.oup.com/elt/global/products/headway/elementary/a_grammar/unit09/hwy_elem_unit09_1/
http://a4esl.org/q/f/y/zz95mck.htm

The Future
http://www.englishpage.com/verbpage/simplefuture.html
http://www.englishpage.com/verbpage/presentcontinuous.html
http://www.englishpage.com/verbpage/verbs18.htm
http://www.englishpage.com/verbpage/verbs19.htm
http://www.englishpage.com/verbpage/verbs20.htm

Adjectives

http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/regcom.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/regcom1.htm
http://www.oup.com/elt/global/products/hway_home/hway_pre-int/hwypreu6_1
http://perso.wanadoo.es/autoenglish/gr.comp.i.htm
http://perso.wanadoo.es/autoenglish/gr.degree.i.htm

Adverbs and adjectives

http://web2.uvcs.uvic.ca/elc/studyzone/200/grammar/adjadv.htm
http://a4esl.org/q/h/9901/gc-advadj.html
http://www.english-zone.com/teach/adjadv1.html
http://www.english-zone.com/teach/adj-inf1.html
http://www.bbc.co.uk/skillswise/words/grammar/interestsentences/adverbs/factsheet.shtml