Hello!

Here are some links so you can study :) :

Present Simple V.S. Present Progressive

1. http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_progressive2.htm  
2. http://www.englishpage.com/verbpage/verbs1.htm  

Comparisons (Comparatives, Superlatives and other forms)

1. http://www.englishexercises.org/makeagame/viewgame.asp?id=6009  
2. http://baladre.info/english/sedaviwebfront/compsup8.htm  
3. http://mrsc.free.fr/3-3-comparatifs.htm  

Relative Pronouns and Adverbs

1. https://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?02
2. http://www.englishexercises.org/makeagame/viewgame.asp?id=2238

Defining and Non-Defining Relative Clauses

1. https://www.ego4u.com/en/cram-up/grammar/relative-clauses/exercises?04
2. http://www.ccc.commnet.edu/grammar/quizzes/cross/quantifiers2.htm  

Quantifiers

1. http://eolf.univ-fcomte.fr/wp-content/uploads/grammar/quantity/03.htm
2. http://www.esl-lounge.com/student/grammar/2g41-quantifiers-gap-fill.php
3. http://grammar.ccc.commnet.edu/grammar/quizzes/cross/quantifiers2.htm

Past Simple V.S. Past Progressive & Used to

1. http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-past.php  
2. http://speakspeak.com/english-grammar-exercises/intermediate/used-to-be-used-to-get-used-to
3. http://www.autoenglish.org/modalverbs/gr.used.i.htm
4. http://www.esl-lounge.com/student/grammar/4g68-used-to-be-used-to.php
5. http://www.perfect-english-grammar.com/past-simple-past-continuous-exercise-1.html
6. https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises
7. https://www.ego4u.com/en/cram-up/grammar/simpas-paspro/exercises?ex07

Regards,

Mtro. Agustín Mario Rodríguez Treviño