Prepositions Afternoon all, I thought I'd start a topic on a basic topic of English grammar. A preposition is a word that normally goes before an object in a sentence to state where is it positioned. I'll type out a few sentences with the preposition missing and anyone is more than welcome to fill in the gap. 1) The boy sat _ the table to eat his dinner. 2) The dog was _ his kennel playing with his toy. 3) The keys were _ the coach, where the lady had left them. 4) The car was parked in the garage _ the house.