Modal verbs for deduction
http://www.carmenlu.com/third/grammar/modals3_1.htm
http://www.esl-lounge.com/student/grammar/4g3-modals-deduction-exercise.php
http://www.carmenlu.com/third/grammar/modals3_1.htm
http://www.esl-lounge.com/student/grammar/4g3-modals-deduction-exercise.php
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