This is what one of Edmond Dantes alter egos did in the Count of Monte Cristo. “Lord Wilmore” was an eccentric Englishman who understood French perfectly well, but refused to speak it:
… Lord Wilmore appeared….His first remark on entering was, "You know, sir, I do not speak French?"
"I know you do not like to converse in our language," replied the envoy.
"But you may use it," replied Lord Wilmore; "I understand it."
The weird thing about knowing a foreign language is sometimes u might offend people for trying to speak their mother tongue when they're working on their English, so like unless you are in a country where that's the spoken language, it's super awkward any time you want to actually use that language that you learned.
