Answer:
David, My younger brother lives in Alberts, Canada.
Explanation:
The highlighted part of the sentence is called a/an Professor Plum , who had been to the mansion before , expertly navigated the maze of rooms andcorridors to quickly reach the conservatory
I think this is what you are wanting to know. You would use a not an If the word/name (Professor Plum) would have been something starting with a vowel instead, you would use an
Is this what you were asking?
An action verb,<span> is a </span>verb<span> that expresses physical or mental </span><span>action.</span>