In order to help my students identify prepositions in s sentence I teach them to use the phrase "the mouse ran" or in this case "hid". If the sentence makes sentence the word following ran or hid is usually the preposition.
To help them identify and use the prepositions in sentences I made this scavenger hunt game.
--- Hide the cards with the mice around the classroom before the students arrive. After instruction have the students search for the mice then write the preposition and a sentence using that preposition. The student's prepositions are going to vary since they can describe where the card is hidden differently.