If there is no theft can you have a robbery?
NO
What must occur immediately before or at the time of the theft?
There must also be violence or threats of violence.
If there is violence or threats of violence after the event does this constitute robbery?
NO. That is simply theft.
What features make robbery Aggravated?
Aggravated robbery is where GBH is done to any person, or there are 2 or more persons or an offensive weapon or instrument involved.