During vs. for
Explanation:
http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv170.shtml
http://www.youtube.com/watch?v=OXEKn9JF9II
Exercises:
http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-44345.php
http://www.english-test.net/esl/learn/english/grammar/ei094/esl-test.php
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