Four students of different nationalities are in a dilemma.
Each speak only two of the following languages: French, English, Spanish and Mandarin.
They do not have a common language that they all speak.
Only one language is spoken by more than two students.

Hints:  
- No one speaks French and Spanish.
- John does not speak English but can act as interpreter when Pierre and Simon wish to communicate to one another.
- Simon speaks Spanish and can converse with Guillaume even though Guillaume does not speak Spanish.
- John, Pierre and Guillaume can not converse in the same language.

Question : Which languages does each student speak?

See answer