General questions:
* "Comment ça va ?" (pronounced "koh-moh sah vah") This is the most common and versatile phrase, meaning "How is it going?" It works for almost any situation.
* "Comment ça se passe ?" (pronounced "koh-moh sah seh pahs") This is slightly more formal and means "How is it going?" or "How is it progressing?".
If referring to a specific task or project:
* "Comment ça avance ?" (pronounced "koh-moh sah ah-vahns") This means "How is it progressing?" and is used to inquire about the advancement of something.
* "Comment ça se déroule ?" (pronounced "koh-moh sah seh deh-roohl") This means "How is it going?" or "How is it unfolding?" and is used to inquire about the course of something.
For a casual inquiry:
* "Comment ça marche ?" (pronounced "koh-moh sah marsh") This means "How is it working?" and is used for casual inquiries about how something is going.
The best phrase to use will depend on the context of your conversation.