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Some prepositions are also conjunctions, or can be used in ways that make them practically the same as a conjunction. These include before, after, and until. Before can also be an adverb (we have been here before), as can after, within, and in (we went in).

The preposition "for" acts as a conjunction in the sentence "The lamps must be lit, for there is no natural light in the cave." (as, or because)

If the words following a preposition express a complete thought (i.e have a verb) then the preposition is acting as a conjunction, and it is a clause, not a prepositional phrase.

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11y ago

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