The God Thing said:
JD said:
How do we know that the characters are actually always speaking english? It could easily just be that we are hearing everything from a Universal translator that is changing everthing into English.
The language the crew of the NCC-1701 spoke was specifically called "English" by 20th century natives Captain John Christopher and Khan Noonien Singh in - respectively - Tomorrow is Yesterday and Space Seed. The signage on the hulls of Starfleet spacecraft also strongly suggests that English has become the lingua franca of the UFP.
TGT
But then again, on DS9's Little Green Men it turns out that the Ferengi don't speak English at all, and have been relying on a UT all along.
My guess is that given that Bajor isn't part of the Federation, none of the non-Starfleet personnel speak English, although Major Kira who had to work with the Feds, and Nog who eventually joined Starfleet would have had to learn it.
Also it would have been a poor spy who couldn't speak his enemies' languages, so Garak would have been bilingual.
It brings up the perennial question of why the UT was so crap with Klingon.
Worf: "I must follow the rite of GHGUHF UJKHFGUK T U, with added apostrophes. It translates into English as a birthday party."