Features of spoken language:

Birmingham model: 

I  - Initiation.

R - Response.

F  - Feedback.

-Structure.
 -Informality / unplanned. -> Ellipsis, contractions, overlaps, non standard, deixis.
-Non fluency features -> Fillers, false starts, pauses, overlaps / interruptions. 


NVAS - Non Verbal Aspects of speech.


V - Volume
I - Intonation / pitch.
P - Pace.
S - Stress / emphasis.


NVC - Non Verbal Communication.
-Body language.