Isnt this "do you know french?" as opposed to "do you speak". Isnt 'speak' 'konuş?
where did we know here thst the subject is (Sen)? why not he or she?
Because of "musun". "-sun" suffix indicates that the subject is "Sen"
Is it right to ask it this way : Fransızca biliyorsunuz mu?
The mu (question particle with vowel harmony) goes before the personal suffix. So it's Fransızca biliyor musunuz. Can you French?
I cant see "do" in words