How does the following sentence from paragraph 19 help develop the plot of the story: “you are not a friend of Luciana because I’m her cousin and I know all her friends. And I don’t know you”?

These lines help to develop the plot of mistrust and amenity among friends.

Explanation:

These lines were spoken by Señora. She is portrayed to be one of the main characters of this story along with Rosaura and Luciana.  

Luciana decides to hold a party at her home and invites Rosaura. She is a nine-year-old year who thinks that Luciana is her friend, but little did she know that Luciana had ulterior motives.

She only invited Rosaura so she could make her do the work and help Senora. Rosaura's mother tried to stop her from going to the party but she did not listen.

what is a theme?

ans: the implicit idea of a written work of literature is called a theme.

so, the only theme of "birdfoot's grampa" by joseph bruchuc is that as a human being one should always remember the value of every life on earth.

the grampa is stopping the car again and again to save those little toads from washing away in the heavy rain is an act of kindness and humanity.

in the door-way, with his head in the room and with a lantern in hand with the most slight ray of light shining from it; so small and opening it so slowly to not disturb the old mans sleep.

i have watched the play of this story last friday.