As its title suggests, this book is a selection of papers that use English corpora to study language variation along three dimensions - time, place and genre. In broad terms, the book aims to bridge the gap between corpus linguistics and sociolinguistics and to increase our knowledge of the characteristics of English language. It includes eleven papers which address a variety of research questions but with the commonality of a corpus-based methodology. Some of the contributions deal with language variation in time, either by looking into historical corpora of English or by adopting the method known as diachronic comparable corpus linguistics, thus illustrating how corpora can be used to illuminate either historical or recent developments of English. Other studies investigate variation in space by comparing different varieties of English, including some of the "New Englishes" such as the South Asian varieties of English. Finally, some of the papers deal with variation in genre, by looking into the use of language for specific purposes through the inspection of medical articles, social reports and academic writing.