The main setting of "seventh grade" is

The setting of a story refers to the time and place in which the story takes place. This is one of the most important elements of a narrative as it allows us to locate the story. In this case, the story "Seventh Grade" has several settings. The main setting is a school in Fresno, California. However, there are more specific settings as well, such as French class and the gym.

often a noun phrase is just a noun or a pronoun:

people like to have money.

i am tired.

it is getting late.

answer: a mother fears that the poor lighting poses a danger to the children who play there.