In this sentence "All of the reports except one were completed." I know that the subject is all but what is the word except in this sentence? Is it a predicate noun adjective I am having a hard time deciding.
In this sentence "except" is a preposition. Its object is "one." The phrase, "except one" is used an adjective, modifying "reports."
The next time you're stuck on a part of speech check a dictionary.
http://dictionary.reference.com/browse/except
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In the sentence "All of the reports except one were completed," the word "except" is functioning as a preposition. It introduces a prepositional phrase that modifies the noun "one."
To determine the function of a word in a sentence, it can be helpful to consider the role it plays and the relationship it has with other words. In this case, "except" is showing an exclusion or exception to the noun "one." It is indicating that one report is not included in the completion, while all others are. Since prepositions typically establish relationships between nouns (or pronouns) and other words in a sentence, "except" is categorized as a preposition in this context.