Common Mistakes : Behind

preposition

.BAD: At night I keep my wallet behind my pillow

.GOOD: At night I keep my wallet under my pillow

behind = at the back of something

.Lizzie ran and hid behind a tree

under (or beneath/underneath) = directly below something, and sometimes touching or covered by it

.Come and stand under my umbrella

.I eventually found the letter under a pile of old newspapers