Answer:
The topic sentence or thesis sentence is just the sentence which states your main idea. Usually, your teacher will assign a topic, and you just have to come up with a paragraph or essay about that.
Write the topic on your paper. Now, make a list of everything you know about that topic - look things up in your textbook or using a search engine if you need to!
You must decide which of these things is most interesting to you - your paper will be much easier if you write about something that you find interesting. That statement will be the topic of your writing; make it into a complete sentence with correct grammar and punctuation. You might try writing a question about the topic that you want to learn about or to explain - change the question into a statement and you have your topic sentence.
** see the related questions below **