Along with four other members of his department, he tried combining enterprise with French - and the success of the project has led him to share it with other modern language teachers in the authority.
The idea was simple - he asked pupils to describe in French a personal object that they wanted to sell to a classmate. Items ranged from second-hand DVDs, computer games or CDs, to unwanted presents, books, posters, toys, make-up, pencil sets - even a cake or large bar of chocolate.
Pupils then wrote descriptions of their sale object in French. The department's French assistant provided useful vocabulary. The descriptions were displayed for all the class to read - some on posters, some on computer screens.
"On the day of the sale, there was a lot of enthusiastic shouting in French: 'Je veux l'acheter!', 'J'offre soixante pence!', 'C'est moche!', or 'C'est genial!' It certainly was fun," said Mr Green.
The project was successful on many levels - it generated a lot of discussion; pupils had to make decisions; they researched French expressions; it was fully inclusive; they contributed to Turnbull Times, the school newspaper, by reporting on the project; and pound;350 was raised for school funds.
For further information, contact: SGreen@turnbull.e-dunbarton.sch.uk