Why bir in this sentence?
You must use "bir" as a article-like thing if you have an general noun with an adjective :)
"Ofiste resmi bir dil kullanıyorum."
Translation: I use formal language in the office.
I am using formal language at the office.
Correct other English answer accepted by Duo.
Yorum is continuing so it should be i am using not i use
Turkish is using this form different than its used in english. It can be "I use" here
I said 'in the office I use formal language' and got the following Duolish gibberish...
You need the article "a" here.
In the office, I use a formal language.
In the first example I translated resmi as official and was marked wrong, should have been formal. Now it is official, after all!
Is there a difference between saying formal language and an official language (of a country)?
Yes, English is the official language of the UK, but if I called you an #@se-hole that would not be formal!