Examples of Prepositions
About above across after against along among around at before behind below beside beneath between beyond by concerning down during except for from in inside into like near of off on onto outside over past out since through to toward under until up upon with within without

Under the boardwalk
Down by the sea
On a blanket
With my baby
That's where I'll be

A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. -

Wm Strunk, Jr.
The Elements of Style