Topic Sentence implies the sentence that contains a subject and a priority will most often placed at the first sentence, or a sentence at the end of the text, usually from other story.
Topic Sentence means a sentence containing a subject and focus the mind. Most often placed in the first sentence. The last sentence of the text or It is often found in the passage
Topic Sentence mean sentence contains subject and gist. Most often placed at the first sentence. Or the last sentence of the text. Seung is usually obtained from the story.