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I want to learn some knowledge about formal and informal of English!I am going to give a speech about this topic,but the materials which Iknow is so short! thanks a lot!
There's plenty of stuff here on formal language- try OWL and other sites. Have a look at the slang and colloquialism section for some informal stuff. http://www.usingenglish.com/links/Writing_Skills/
formal ang informal English 
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