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When the sentence has nothing to do with the paragraph that is written.
In your mind, change the topic sentence into a question. If the information can be used as an answer to that question, then it is good supporting information. Any information which does not directly answer the topic "question" can be eliminated.
It is the first sentence of a paragraph which is the topic sentence.
if a paragraph does not have a topic sentence then
the first sentence of the paragraph is called the topic sentence which should describe most of the paragraph for the reader to understand. The topic sentence is usually the first sentence of a paragraph. It makes a statement (about a topic) and the rest of the paragraph explains the topic sentence or gives examples of the topic sentence. The second sentence of a paragraph can sometimes be the topic sentence. Sometimes it is called a summary sentence.
if a paragraph does not have a topic sentence then
Generally the topic sentence is the first sentence of the paragraph and the rest of the paragraph explains or gives examples of the topic sentence. The topic sentence can also be the second sentence of the paragraph. This is when the first sentence is a linking sentence that links the paragraph to the previous paragraph. Sometimes the topic sentence can be the last sentence in the paragraph
Final.
A deductive paragraph is a paragraph in which the topic sentence is stated first. The first sentence of a deductive paragraph should be the topic sentence.
The topic sentence lets the reader know what the paragraph is about.
The topic sentence of the paragraph is "A trip to the ocean can be a relaxing escape from life." The sentence that is unrelated to the topic and can be eliminated is "You should always be careful to avoid overexposure to the sun at the beach."
The sentence in a paragraph that summarizes what that paragraph is about