Writing the Pefect Paragraph

A pefect pargargh includes 5 sentences:

Sentence 1: Topic Sentence

Sentence 2: Supporting Idea #1

Senetence 3: Supporting Idea #2

Sentence 4: Supporting Idea #3

Sentence 5: Concluding Sentence

Remember to use linking words: first, second, finally and in conclusion.

Question: Name one purpose for a topic sentence and give example.