Preposition stranding
Preposition stranding or p-stranding is the syntactic construction in which a so-called stranded, hanging, or dangling preposition occurs somewhere other than immediately before its corresponding object; for example, at the end of a sentence. The term preposition stranding was coined in 1964, predated by stranded preposition in 1949. Linguists had previously identified such a construction as a sentence-terminal preposition or as a preposition at the end.
Preposition stranding is found in English and other Germanic languages, as well as in Vata and Gbadi (languages in the Niger–Congo family), and certain dialects of French spoken in North America.
P-stranding occurs in various syntactic contexts, including passive voice, wh-movement, and sluicing.