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'.

'I just didn’t see them. I drove through the traffic lights when they were red.' 'He wasn’t tall enough and couldn’t climb over the fence.' In these two examples, through and over are prepositions and ...