There are only six modern Celtic languages, they are Welsh, Cornish, Breton, Irish, Manx, and Scottish Gaelic.
As you can see Greek is not included in the modern Celtic languages, so Greek is not a Celtic language.
Answer:
Maybe because some of the questions you answered are wrong?
Explanation:
English<span>, </span>French<span>, </span>Spanish<span>, </span>Russian<span>, </span>Arabic<span>, and </span>Chinese<span>.</span>
