The difference between oral language and written language is that one is informal and the other one is formal when use for communicating. Oral language is very casual and informal, which you can use when text to or have a conversation with someone you are familiar. On the other hand, written language tends to be used in more serious occasions, such as writting an academic paper, sending an email for bussiness purposes, and constructing a resume for your interiew. Thus, one should be aware the difference between these two forms of language, and use carefully when speak your minds.
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