These terms can indicate the direction, time, location or introduction of an object. For example, in the sentence, "The neighbor is at the door," at is the preposition indicating location.

Many people who never learned about adverbs, adverbials and how prepositions relate to objects get “a while” and “awhile" right anyway.

But in fact, the object of the preposition “to” is the whole clause “whoever wants to hear about the story of the hat.” That’s because “wants” needs a subject and only “whoever ...

It's long been thought that ending a sentence with a preposition instead of following the word with an object is grammatically wrong, but many people still do so in phrases like "Who are you here ...