David Adger is Professor of Linguistics at Queen Mary University of London. He's created new languages for TV series and films and he explains to Michael Rosen how he goes about it. For his latest language he used existing Creole languages for his 'conlang', or constructed (artificial) natural language. He talks Michael through the grammar and language principles he applies to his creations and lets him try his hand at the monsters' language he invented for a televised version of Beowulf.

Producer: Maggie Ayre