Preposition the preposition "in" introduces a prepositional phrase "in his office," which acts as an adverb describing the location of the missing papers. Conjunction You can use a conjunction to link words, phrases, and clauses, as in the following example: I ate the pizza and the pasta. Call the movers when you are ready. Coordinating Conjunctions You use a coordinating conjunction ("and," "but," "or," "nor," "for," "so," or "yet") to join individual words, phrases, and independent clauses. Note that you can also use the conjunctions "but" and "for" as prepositions. In the following sentences, each of the highlighted words is a coordinating conjunction: Lilacs and violets are usually purple. In this example, the coordinating conjunction "and" links two nouns. This movie is particularly interesting to feminist film theorists, for the screenplay was written by Mae ...