29:29Learning
'must have', 'might have', 'should have' & 'can't have' to talk about the past: Live English Class
BBC Learning English
Functions (Part III)
From the creator
Even more examples of function exercises. Introduction of a graph as definition of a function. More free lessons at: http://www.khanacademy.org/video?v=5fcRSie63Hs
Published 2007-03-18 · Watch on YouTube ↗
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