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Past tense of 'should' - "I should have", "You shouldn't have", etc.
source: English Lessons with Alex 2010年9月4日
http://www.engvid.com/ The word 'should' doesn't follow the normal rules in English, when used in the past tense. In this grammar lesson, I explain how to use 'should' in the past tense to form sentences like "I should have watched the lesson."