As opposed to native languages, these languages must be studied before they can be read or spoken. A character who knows a foreign language will be able to read, speak, and understand that language, but will sound like a foreigner if used in the nation of that language's origin. As a simple example, an American student who studies Spanish for two years can get by in Spain, but it will be obvious to the Spaniards that the person is from America. Constructs taking Foreign Languages can benefit from a more thorough command of the language, but their artificial voices will always sound tinny and monotonous.
1. Talks like a tourist. Can speak and read simple sentences (3rd grade equivalent; few idioms known)
2. Talks like a worldly tourist; well versed in that language. Does not insult listeners simply by speaking. (6th grade equivalent)
3. Firm command of the language. Foreign accent is still a giveaway, but natives will appreciate the dedication the character has toward their language. Decent knowledge of idioms. (10th grade equivalent)
4. Masterful command of the language. Only a faint trace of accent remains. Most of the nuances of the language are known. (College-level equivalent.)