
Well, English, obviously.
The Big Bang Theory Season 12, Episode 14

English - SDH
The Big Bang Theory Season 10, Episode 10

or possibly penguins,
her English is atrocious.
The Big Bang Theory Season 10, Episode 6

English - SDH
The Big Bang Theory Season 10, Episode 13

Fine, I'll do it in English,
The Big Bang Theory Season 5, Episode 24