This was asked recently in the guise of speaking to an NPC in another language. A partial solution: [code]Understand “lo siento” as saying sorry when the person asked is Maurice.
Maurice and Bob are men in the library.
Persuasion for asking maurice to try saying sorry: say “No problemo.” instead.[/code]
To finish the solution, the pre-existing Understand rules need be flagged as gibberish to Maurice. Either 1) removing all grammar lines, then re-adding them with a “when the person asked is not Maurice” clause, or 2) create a To Decide Whether clause which sets a global Is Spanish boolean (and returns true), used on just the Spanish lines, with the global being re-initialized to false Before Reading A Command.
A Persuasion rule for Bob that rejects Is-Spanish, and a Persuasion rule for Maurice which rejects not-Is-Spanish.
And probably a Saying Gibberish action that both guys will use for responding to such. (“What?” / “Que?”)