How do you know if a French guy is into you?

If he likes you, he will call. Theres no point in wondering how to tell if a French man likes you because if he does and wants to pursue a relationship with you, he will call and text. If he likes you, it means hes going to keep in touch. And often. There are no calling rules or games here when dating a French guy.

Can you call a girl Mademoiselle?

The basic rule is simple. If the woman is married, you should say “madame” (even if she is a widow: once married, always “madame”.) If she isnt, you should say “mademoiselle”.