Answer:
I- priestlys message was to get through to the audience that choices have consequences. By ending the play exactly how it started it represents how you will repeat the same mistakes if you do not change your ways.
ii- during that time of society it showed how what class you was in was supposed to be important and if you were higher class, you was better than anyone. Which was not true.
iii- the younger Birlings such as Eric and Sheila will answer more truthful than they did with the first inspector as they want to right what they have done wrong whilst the older generation (mr and mrs birling) will not as from start to finish they didn’t see that they did anything wrong and that it was all eva smiths fault.
Hope this helped, try put it in your own words and take ideas and go into more detail. X