When can we use "ya" instead of "you" in soeaking and writing?
Can "ya" be always used instead of "you" or there's a rule?

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You can use it while speaking but never in writing.  Ya is american slang,  I dont know the rules because it is slang and doesnt have rules >.>

Answer

As a general rule - 'ya' is very informal, 'you' is normal/formal. I wouldn't ever use 'ya' in writing unless I writing a short message to a friend. Don't use it in a job application or anything important!

In speaking, I wouldn't use it often at all. To me it sounds like something more common in Australian or some American accents.

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