"Bob used discretion when speaking to the movie star eating in the diner."
I don't think this is a question.
Answer:
<em>In</em><em> </em><em>Which</em><em> </em><em>tense</em><em> </em><em>or</em><em> </em><em>speech</em><em> </em><em>we</em><em> </em><em>should</em><em> </em><em>change</em><em> </em><em>it</em><em> </em><em>?</em>
Answer:
It is a preposition.
Explanation:
A preposition is a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause, as in “the man on the platform,” “she arrived after dinner,” “what did you do it for ?”
An adverb is a word or phrase that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree, etc. (e.g., gently, quite, then, there ).
Hope this helps : )
