is "I want to improve Portuguese" correct?
I read this in the profile of a person who messaged me to talk about her work as a missionary. That sentence sounds to me as if she wants to improve the Portuguese language. Am I wrong? Isn't it necessary to say "my Portuguese"?

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Answer

Yes you are right! 
If you don't put the "my" before it will sound like she wants to improve Portuguese as a language and not her own skill of it!
Do message and correct her, it could be a nice conversation starter :)
Hope I helped! 
     -Sasha