Explanation: The tone of a text or sentence is the author's or speaker's attitude towards the audience, the subject or even the characters of the text. There are many different kinds of tones, like: positive, negative, objective, sad, angry, etc. In the given lines we can see that the speaker is using a sad tone, he describes to be experiencing a lot of sorrow because of the lost of Lenore.
breathe, think and analyze the situation, pull them aside and talk to them about it
quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.
the topic sentence in this paragraph is:
topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.
which incidentally tells you what a topic sentence should be.