Why do we use topic sentences

A topic sentence has many important duties to a paragraph.

A topic sentence must highlight the main idea of a paragraph, letting the reader know what the paragraph will be about. The topic sentence must present an idea that will unify the rest of the paragraph while relating it back to the main thesis of the paper.

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We use them to help the reader understand what the paragraph will be about/what it was about before or after reading it.

Explanation:

active voice: my father cut the tree.

passive voice: the tree was cut by my father.

active voice: people buy newspapers every day.

passive voice: newspapers are bought (by people) every day.

active voice: people have been using movies as political propaganda since world war ii.

passive voice: movies have been used as political propaganda since world war ii.

active voice: donna gave me my birthday present.

passive voice: i was given my birthday present (by donna). / my birthday present was given to me (by donna).

active voice: mom will leave the keys on the counter.

passive voice: the keys will be left (by mom) on the counter.

the words in parentheses are the agent of the passive voice and can be omitted when obvious, generic, or simply unnecessary.

use the headings to create an overview of the main points.