Some prepositions show the direction in which an object is moving.
I walked to the beach.
The squirrel ran across the wire.
We drove through the tunnel.
Jack ran down the stairs.
A preposition always begins a prepositional phrase. Sometimes, the preposition tells the direction in which an object is moving.
It’s your turn. Find the preposition in this sentence that shows direction: I climbed up the ladder. Did you figure it out? Good for you!