MODAL VERBS
http://www.montsemorales.com/gramatica/ObligProhib.htm
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/330-modals-not1.htm
http://www.grammarbank.com/be-allowed-to-vs-let.html
FIRST CONDITIONAL
http://www.englishgrammarsecrets.com/firstconditional/exercise1.swf
http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/1cond1.htm
http://www.bnv-bamberg.de/home/ulrich.koch/flg/englischinteraktiv/ifclauses1a.htm
passive voice
http://www.ecenglish.com/learnenglish/lessons/passive-tense-review/
http://learningapps.org/123565
GOING TO
http://www.carmenlu.com/first/grammar/begoingto1_2.htm
http://www.grammarbank.com/be-going-to.html
REFLEXIVE PRONOUNS
http://www.english-4u.de/refl_pronouns_ex1.htm
http://www.ego4u.com/en/cram-up/grammar/pronouns/exercises?06
RELATIVE PRONOUNS AND RELATIVE CLAUSES
http://www.esltower.com/GRAMMARQUIZ/intermediate/relative%20pronoun.htm
http://www.englishexercises.org/makeagame/viewgame.asp?id=1255
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