To build motivation for the character gives a backbone to the story and about the Arthur for example if the Arthur got the motivation from seeing a kid take a candy out of a store that motivation for that character would be a bad guy or a heel and or antagonist there for the motivation for a character is very important they reveal it so you can get a bit of a background on the character in more information on the story and the Arthur.
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The subject would be that marcy likes goldfish, therefore, the goldfish is a noun
The words that describe the community where she rented a house may describe best the type of people that the narrator may encounter. The kind community usually reflects the type of inhabitants. Thus, strange and unusual people may come from that kind of communities as well.