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Prepositions by Themselves Can Function as Adverbs

     When their objects are understood, prepositions often function as adverbs. In the sentence, "Come in." it is understood that the speaker is inside something -- a room, a house, a den -- so the object of "in" is left out. In such cases, you can usually consider the preposition by itself to be an adverb.
Image is adapted from
one by Robert Day for
Fun Fare: A Treasury of 
Reader's Digest Wit 
and Humor
N.Y. Simon and Schuster, 
1949, 237.
Mama Skunk
1. Put parentheses ( ) around each prepositional phrase.
2. Underline subjects once, finite verbs twice, and label complements ("PN," "PA," IO," "DO").
3. Draw an arrow from each preposition (without an object) to the word it modifies.

     Mama Skunk was worried because she could never keep track of her

two children. They were named In and Out, and whenever In was in, Out

was out; and if Out was in, In was out. One day she called Out in to her 

and told him to go out and bring In in. So Out went out and in no time at 

all he brought In in.

     "Wonderful!" said Mama Skunk. "How, in all that great forest, could

you find him in so short a time?"

     "It was easy," said Out. "In stinct."

--This Week Magazine