29:29Learning
'must have', 'might have', 'should have' & 'can't have' to talk about the past: Live English Class
BBC Learning English
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/earth-history-topic/moon-phases-and-eclipses/v/intro-to-moon-phases An introduction to the size of the Moon, the distance to the Moon, the relation of the 28-day cycle of the Moon to a month and understanding the phases of the Moon.
Published 2017-08-11 · Watch on YouTube ↗
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29:29BBC Learning English
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26:06The Royal Institution
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