Exercise 7, j. : With G sharp as the soprano note, write in four parts a triad in first inversion, with the subdominant of G sharp minor in the bass. It seemed to me that such a chord does not exist. The book does not have answers to its exercises. Edit: Added a photo of the page!
The subdominant of G♯ minor is C♯ minor. The C♯ minor chord is C♯-E-G♯. The first inversion of that chord is E-G♯-C♯. So that would mean that E should be the bass note.
But the question is a bit badly worded in that it asks you to put the subdominant of G♯ minor in the bass which could make you think that C♯ should be in the bass. But then it would be root position and not first inversion.