English language

English was the language originally spoken in England. It was also spoken throughout much of the world. Though common, it was not the most common; in the early 21st century, Mandarin was most widely spoken. (TW: Children of Earth: Day One) It was said to be easier for the Eurozone to know English, than to teach the world other languages. (EDA: Trading Futures)

The Doctor's favourite language was English. (BFA: ...ish) The First Doctor told Dodo Chaplet that he would teach her proper English after she said "okay". (DW: The Ark)

Shanquis was terraformed by English-speaking humans. The terraforming device was left online after the humans on the planet died out, allowing anyone who spoke English to control the structure of Shanquis. (CC: Bernice Summerfield and the Criminal Code)