Prepositional phrases are groups of words that start with a preposition (like "on," "in," or "at") and usually describe the location, time, or direction of something in a sentence. Full definition
It also provides examples of misplaced phrases / modifiers to help students to recognise when they have not placed prepositional phrases in a sentence correctly. (tes.com)
Or the 18 - month - old who's still communicating with grunts and gestures suddenly bursts forth with prepositional phrases at 2 years. (babycenter.com)