Answer:
true.
Step-by-step explanation:
A topic sentence, usually the first sentence in a paragraph, summarizes succinctly and concisely the main idea in the paragraph. It could be said to be the guide that structures the paragraph. As such, all the sentences in the paragraph should be related to the topic sentence in order to create coherence throughout the text. If there are sentences that do not relate to the topic sentence, they should be eliminated or at least reformulated in order to guarantee coherence and unity.