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WORK TO
IMPROVE
http://web2.uvcs.uvic.ca/elc/studyzone/330/grammar/0cond1.htm
http://www.agendaweb.org/verbs/conditional-mixed-exercises.html
http://www.myenglishpages.com/site_php_files/grammar-exercise-conditionals.php
http://first-english.org/english_learning/if_clauses_conditional/a_if_clauses_conditional.htm
http://www.perfect-english-grammar.com/conditional-exercises.html
http://speakspeak.com/english-grammar-exercises/upper-intermediate/zero-first-second-third-conditionals
https://www.ego4u.com/en/cram-up/grammar/conditional-sentences
http://www.englishexercises.org/makeagame/viewgame.asp?id=10753
http://www.agendaweb.org/verbs/present_simple-exercises.html
https://www.ego4u.com/en/cram-up/tests/simple-present-1
http://www.myenglishpages.com/site_php_files/grammar-exercise-simple-present.php
http://www.englisch-hilfen.de/en/exercises/tenses/simple_present_mix.htm
http://www.englisch-hilfen.de/en/exercises_list/zeitformen.htm
http://www.english-4u.de/present_ex1.htm
http://www.englishpage.com/verbpage/verbs1.htm
DEMOSTRATIVOS
https://www.englishlessonviaskype.com/this-that-these-those/