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<em>Hi there!</em>
<em>~</em>
<em>He worked with us for a while, then </em><em><u>one</u></em><em> day he just quit.</em>
<em>❀Hope this helped you!❀</em>
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Answer: Yes with possible slight variation A main idea is more general, while a concept is more specific. For example in an essay about child labour you could say the main concept is child labor, but the main idea is how to combat child labor.
Explanation: