I need to prove someone wrong. Please help

edited July 13 in General
  I’m debating with a friend if it is ok to say completely Everything?  And  another thing,  I can say something like “I promise and I’m serious,I promise to......”  given that he doesn’t believe me sometimes when I sa” I promise”, so I said “im serious”. I just wanted to prove to him that those two expresiones are not wrong.
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