How has the author used the narrative structure of "There Will Come Soft Rains" to communicate his message?
There are a number of ways in which this question could be answered, but I would want to focus on the way in which this story presents the level of technology in this future world combined with the absence of any human figures. One of the amazing aspects of this tale is the way in which we are presented with a house that is so technologically advanced that humans are not necessary for it to continue in its duties. It is completely self-sufficient even without its owners, as the following quote makes clear:
Eight-one, tick-tock, eight-one o'clock, off to school, off to work, run, run, eight one! But no doors slammed, no carpets took the soft tread of rubber heels. It was raining outside. The weather box on the front door sang quietly: "Rain, rain, go away; rubbers, raincoats for today..." And the rain tapped on the empty house, echoing.
What is notable is the extremely sophisticated level of technology in a setting where the only mention of humans are the dusty "silhouettes" of the family that once lived in this house, who have obviously been wiped out by some sort of nuclear attack. Bradbury thus forces us to ask ourselves harsh questions about our level of technology and our cleverness. The same technology that is responsible for this amazing house is also responsible for the weapons that eradicated humans from the planet. What is the use of such cleverness and ingenuity if we do not have with it the humilty to accept our fragile and vulnerable position in our world? What use is our technology without the wisdom to use it wisely?