“Vampires! Zombies! Werewolves!” “Where?!” “Behind you!”
Thank goodness for prepositions. Imagine not knowing where the danger lay!
Prepositions tell us where or when something is in relation to something else. When monsters are sneaking up on you, it is good to have these special words to tell us where those monsters are. Are they behind us or in front of us; are they near or far; will they be arriving in three seconds or at midnight?