"with" and "as", what's different between these two?
"With" is a preposition that is used to indicate relation between two things or accompaniment of one thing to another. It can also be used to express the cause of something, as seen in this context. Ex: He is sick with the flu. "As" can be used as an adverb, a conjunction, or a preposition. As a preposition, the word "as" is used to make a comparison, or to show the function of something or a characteristic that something possesses. In the context of this sentence, it would not work to replace "with" with "as" because "as" would not express the cause of the diagnosis. Ex: He is known as a very smart person.
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