Why is the careful observation of the key sentence important in identifying the main idea of a paragraph?

It is important because the key sentence most likely contains the main idea of a paragraph and can tell a reader what the paragraph is all about.

Explanation:

The careful observation of the key sentence is important when trying to identify the main idea of a paragraph because it gives an insight on what the supporting details in the paragraph would be.

Every main idea needs supporting details to validate them. For example, if the main idea of a paragraph is that tigers are dangerous animals then it must contain supporting details that show why a tiger is dangerous.

the primary theme of "elegy written in a country churchyard" is a reflection about the significance of the lives of a group of modest people buried in a rural church cemetery. elegies focus on the death of an individual or group of people, and they generally have a melancholy tone. hope this you all.

he is suggesting that this widow is a strong woman, who is giving constructive criticism and she has enough to worry about, and she takes care of him, so he does not take it to heart.