How do you ask someone where they are from in french?
D'où venez-vous ?
Comment allez-vous is the standard phrase you would use when you want to ask someone how they are in French. This phrase is most commonly used when you are talking to strangers, elders, or someone in a formal setting. Comment ca va is a far less formal way to ask how someone is doing in French. You would reserve this phrase for friends and family members.
It depends on who you're speaking with: "parles-tu français?" (is said to a friend, someone "familiar" or someone younger) "vous-parlez français?" (someone older, of higher position - like an elder, boss or teacher) "tu parles français" and "vous parlez français" are also accepted. To ask if French is generally somewhere (like in a store or a country) you can ask "On parle français ici?"