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Grammar
If-clauses
      - http://www.perfect-english-grammar.com/conditionals.html
      - http://www.edufind.com/english-grammar/conditional/
Two-part verbs 
      - http://grammar.ccc.commnet.edu/grammar/phrasals.htm
      - http://www.learn-english-today.com/phrasal-verbs/phrasal-verb-list.htm
      - https://www.ego4u.com/en/cram-up/grammar/phrasal-verbs
      - http://www.gingersoftware.com/content/grammar-rules/verbs/phrasal-verbs/
      - http://grammar.ccc.commnet.edu/grammar/phrasals.htm
      - http://www.usingenglish.com/reference/phrasal-verbs/
Transition words
      - http://library.bcu.ac.uk/learner/writingguides/1.33.htm
      - https://www.dlsweb.rmit.edu.au/lsu/content/4_writingskills/writing_tuts/linking_LL/linking3.html
      - http://www.smart-words.org/linking-words/transition-words.html 
      - http://www.english-at-home.com/grammar/linking-words/
Modals
      - http://www.perfect-english-grammar.com/modal-verbs.html 
      - http://esl.fis.edu/grammar/rules/modal.htm
      - http://www.myenglishpages.com/site_php_files/grammar-lesson-modals.php
      - http://www.englisch-hilfen.de/en/grammar/hilfsverben2.htm
      - http://www.gingersoftware.com/content/grammar-rules/verbs/modal-verbs/ 
      - http://www.englishpage.com/modals/modalintro.html
Passive
     - https://www.ego4u.com/en/cram-up/grammar/passive
     - http://www.edufind.com/english-grammar/passive-voice/
     - http://grammar.ccc.commnet.edu/grammar/passive.htm