Prepositions in English - 'at', 'on', 'in'

source: Learn English with Rebecca   2008年11月2日 Many students have problems with prepositions in English. In this lesson, I explain how three prepositions -- 'at', 'on', and 'in' -- are used in relation to time. If you have any questions about this lesson, please ask me on engVid, where I will be happy to help you.