What is a preposition? Prepositions are words that usually go before a noun or a pronoun. They express things like: Time. I start classes at 8am. Place . The food is in the fridge.

L’astronaute de l’Agence spatiale canadienne Marc Garneau, 51 ans, salue les medias et amis lors de sa sortie. Marc Garneau participe a sa troisieme mission spatiale. Jeudi, le 30 novembre 2000.