“Guy” began with Guy Fawkes, then shifted from a burned effigy to a shabby person, and later to the everyday word we use now.

“Paparazzi” began as Paparazzo, a photographer in Fellini’s film La Dolce Vita, then became the general word for celebrity chasers.

English often adds do in present simple questions, like “Do you know?” Here is how that pattern developed and how it works today.