Question

Put "Is not Susan a very fine orator?" into the affirmative?

Answer 1

Susan is a very fine orator, isn't she? is one option.
Susan is a very fine orator. is another.

Explanation:

Is not Susan a very fine orator? has someone saying, admittedly a bit awkwardly, that Susan is a fine orator and is looking for confirmation from those around (if we were to word it slightly differently, it might be:

Susan is a very fine orator, isn't she?

To put our question into the affirmative, we can use the sentence above and to make it even stronger, we can drop the question at the end:

Susan is a very fine orator.