Ending in a preposition

A preposition is a word that creates a relationship between other words, such as with, by, on, in, at, to, or about. Generally, a preposition connects a verb, noun, or adjective to a noun or pronoun.
Often, but not always, a preposition is found before the noun or pronoun in a sentence or clause. For example, the instructional designer ran along the corridor.
Traditionally, grammar rules say not to end a sentence in a preposition but often to change it makes the sentence clumsy or formal. Keep the reader (students) and clarity in mind.