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'.

“From”, “at”, “since” or “around” – prepositions like these help us to locate things. They point us in the right direction – in time or place, for example. But it is not always as simple as it seems.