A preposition is a word that tells you where or when something is in relation to something else. Examples of prepositions include words like 'after', 'before', 'on', 'under', 'inside' and 'outside'.

Last week, we identified ‘in the bus’, ‘enter into a place’ and ‘discuss about’ as some of the prepositional/tautological errors we should avoid. When using public transportation, you are on a bus — ...