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'.

Australia is an island country, which means that it is surrounded by water. The coastline of Australia is over 30,000 kilometres long. In this lesson, you will test your understanding of prepositions ...

On the Internet, that storehouse of dubious advice, you can still find statements about grammar and usage like this one: “One is still officially supposed to avoid ending sentences with prepositions.

In each item below, the sentence contains a highlighted conjunction expressing a time relationship, followed by a preposition in parentheses. In the blank box under each item, rewrite the sentence ...

NPR's Ari Shapiro speaks with John McWhorter, Columbia University linguist and New York Times columnist about the recent Merriam-Webster declaration that English sentences may end with prepositions.