PRE-INTERMEDIATE

Present Simple vs Present Progressive
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex09
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex10
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex11
http://www.ego4u.com/en/cram-up/grammar/simpre-prepro/exercises?ex12
http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive2.htm
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/simcon1.htm
Comparative form
https://elt.oup.com/student/englishfile/elementary/a_grammar/file08/grammar08_a01?cc=global&selLanguage=en
https://elt.oup.com/student/englishfile/elementary/a_grammar/file08/grammar08_a02?cc=global&selLanguage=en
http://www.myenglishpages.com/site_php_files/grammar-exercise-grammar-comparatives-superlatives.php#.Uub5TRC3Vdg
https://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_c01?cc=global&selLanguage=en
https://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_c02?cc=global&selLanguage=en
https://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_d02?cc=global&selLanguage=en
https://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_d01?cc=global&selLanguage=en
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises?02
http://www.tinyteflteacher.co.uk/learning-english/grammar/exercises/as-as-adjectives.html
Superlative form
http://elt.oup.com/student/englishfile/elementary/a_grammar/file08/grammar08_b01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/elementary/a_grammar/file08/grammar08_b02?cc=global&selLanguage=en
http://www.myenglishpages.com/site_php_files/grammar-exercise-grammar-comparatives-superlatives.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-6657.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-5973.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-53556.php
http://www.myenglishpages.com/site_php_files/grammar-exercise-grammar-comparatives-superlatives.php
http://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_d01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile
Other forms of Comparison
http://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_c01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_c02?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_d02?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/file04/grammar04_d01?cc=global&selLanguage=en
http://www.myenglishpages.com/site_php_files/grammar-exercise-grammar-comparatives-superlatives.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-6657.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-5973.php
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-53556.php
http://www.ego4u.com/en/cram-up/grammar/adjectives-adverbs/adjectives/exercises?02
http://www.tinyteflteacher.co.uk/learning-english/grammar/exercises/as-as-adjectives.html
Some / Any / No / Every and their compunds 
http://www.myenglishpages.com/site_php_files/grammar-exercise-some-any.php
http://www.aulafacil.com/Ingejerc/Lecciones/Ejerc12.htm
http://www.aulafacil.com/Ingejerc/Lecciones/Ejerc14.htm
Past Simple regular and irregular verbs
http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_mix.htm
http://www.englishgrammarsecrets.com/pastsimple/exercise1.html
http://www.englishgrammarsecrets.com/pastsimple/exercise2.html
http://www.englishgrammarsecrets.com/pastsimple/exercise3.html
http://www.englishgrammarsecrets.com/pastsimple/exercise4.html
http://www.englishgrammarsecrets.com/pastsimple/exercise5.html
http://elt.oup.com/student/englishfile/preint/a_grammar/file02/grammar02_a01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/file02/grammar02_a02?cc=global&selLanguage=en
Used to
http://www.englishgrammarsecrets.com/usedto/exercise1.swf
http://www.englishgrammarsecrets.com/usedto/exercise2.swf
http://elt.oup.com/student/englishfile/preint/a_grammar/file07/grammar07_c01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/file07/grammar07_c02?cc=global&selLanguage=en
http://www.perfect-english-grammar.com/used-to-exercise-1.html
http://www.englishexercises.org/makeagame/viewgame.asp?id=3728
https://elt.oup.com/student/solutions1stedition/int_unit_page/unit2/grammar/exercise2?cc=cz&selLanguage=cs
http://www.englishgrammarsecrets.com/usedto/exercise1.html
http://www.englishgrammarsecrets.com/usedto/exercise2.html
http://www.englishexercises.org/makeagame/viewgame.asp?id=3728
http://www.englishexercises.org/makeagame/viewgame.asp?id=1230
Relative Pronouns / Adverbs (who, which, that, where)
http://www.ego4u.com/en/cram-up/tests/relative-clauses-1
http://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?08
http://www.myenglishpages.com/site_php_files/grammar-exercise-relative-clauses.php
http://www.espressoenglish.net/relative-clauses-exercises/
http://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns2.htm
Conditional Sentences Type 1
http://www.englishgrammarsecrets.com/firstconditional/exercise1.html
http://www.englishgrammarsecrets.com/firstconditional/exercise2.html
http://english-quiz.net/conditionals-first-test.html
http://english-quiz.net/conditional-first-test.html
http://www.englishgrammarsecrets.com/firstconditional/exercise3.html
http://www.englishgrammarsecrets.com/firstconditional/exercise4.html
http://www.esl-lounge.com/student/grammar/2g24-first-conditional-exercise.php
http://www.learnenglish-online.com/grammar/tests/1stconditional.html
https://elt.oup.com/student/englishfile/preint/a_grammar/file06/grammar06_a01?cc=global&selLanguage=en

https://elt.oup.com/student/englishfile/preint/a_grammar/file06/grammar06_a02?cc=global&selLanguage=en
Time clauses (when, after, before, until, as soon as)
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/410-future-time-clauses1.htm
http://web2.uvcs.uvic.ca/elc/studyzone/410/grammar/410-future-time-clauses2.htm
http://www.e-grammar.org/time-clauses/test1-exercise1/
http://www.e-grammar.org/time-clauses/test1-exercise2/
http://wwwedu.ge.ch/cptic/prospective/projets/anglais/exercises/time1.htm
All / Both / Neither / None / Either 
https://www.usingenglish.com/quizzes/44.html
https://www.ego4u.com/en/cram-up/vocabulary/both-either-neither-nor
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-4826.php
http://www.snt-brugge.be/hotpot/hotpothtm/E/4/G/6/e4g06004bum.htm
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-26838.php
https://www.usingenglish.com/quizzes/52.html
http://esldivlabs.vcc.ca/ELSA/Instructor_Web_Exercises/Grammar/Either_Neither_Both_Cloze_1.htm
Clauses of Result
http://mbonillo.xavierre.com/exercises/bch2/2bch2009/resrph2bch3.htm
http://www.carmenlu.com/third/grammar/resultcl3-2.htm

Quantifiers

http://www.myenglishpages.com/site_php_files/grammar-exercise-quantifiers.php
http://www.myenglishpages.com/site_php_files/grammar-exercise-quantifiers.php#.UjYsoMa9RjU
http://www.esl-lounge.com/student/grammar/2g41-quantifiers-gap-fill.php
http://www.grammarbank.com/quantifiers-exercises.html
http://www.grammarbank.com/quantifiers-exercises-2.html
http://www.englishexercises.org/makeagame/viewgame.asp?id=4307
Past progressive
http://www.aulafacil.com/Ingejerc/Lecciones/Ejerc19.htm
http://www.englishgrammarsecrets.com/pastcontinuous/exercise2.html
http://www.englishgrammarsecrets.com/pastcontinuous/exercise3.html
http://www.englishgrammarsecrets.com/pastcontinuous/exercise1.html
http://www.englishgrammarsecrets.com/pastcontinuous/exercise4.html
http://www.myenglishpages.com/site_php_files/grammar-exercise-past-progressive.php
http://elt.oup.com/student/englishfile/preint/a_grammar/file02/grammar02_b01?cc=global&selLanguage=en
http://elt.oup.com/student/englishfile/preint/a_grammar/file02/grammar02_b02?cc=global&selLanguage=en
Past Simple vs Past Progressive
http://www.englishpage.com/verbpage/verbs3.htm
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises
http://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex08
http://www.englisch-hilfen.de/en/exercises/tenses/simple_past_progressive.htm
Reading
http://www.myenglishpages.com/site_php_files/reading_science.php
http://www.myenglishpages.com/site_php_files/reading_wall_of_china.php
http://www.myenglishpages.com/site_php_files/reading-7-ways-to-protect-the-environment.php