PAC

what must be present to make a perfect authentic cadence?

7th chords

When hearing 7th chords what is the difference between the half diminished and the fully diminished 7th chords

7th chords

When hearing 7th chords what is the difference between a dominant 7th and a major 7th

Cadences

is there any way to get a PAC without using a I chord ?

Intervals

I still can not figure out how to reconize intervals whats a good study method besides just playing them myself and/or having some one else play them for me?

Eb instruments still

I'm sorry yall. I'm still so confused. When
I'm in concert pitch, do I transpose Eb
instruments up or down a Perfect 5th?

Suspensions

Here's my dumb question: Okay I missed the day suspensions were introduced and I've been a bit confused ever since, which notes are you looking at to find the interval for the suspension? Are you looking at the other note in the bass cleff (the presumed tenor) or soprano/'alto' note?

(I usually just found whatever one worked and went with it but it'd be nice to know if there's a rule about that I've been retarded about.)