GRAMMAR: OBLIGATION OR NO OBLIGATION
Obligation or no obligation: have/has to, had to
http://www.englisch-hilfen.de/en/exercises/tenses/have_to.htm
http://www.englisch-hilfen.de/en/exercises/tenses/do_not_have_to.htm
http://www.eclecticenglish.com/grammar/HaveTo1A.html
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-30323.php
http://www.englishexercises.org/makeagame/viewgame.asp?id=8969
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