How do you write wat are doing in marathi?

There are a couple of ways to write "what are you doing" in Marathi, depending on the context and formality:

Formal:

* तुम्ही काय करत आहात? (Tumhi kay karat ahat?) - This is the most common and formal way to ask.

Informal:

* काय करत आहात? (Kay karat ahat?) - This is a more informal way to ask, often used with friends or family.

* काय चालू आहे? (Kay chaloo ahe?) - This is a casual way to ask "what's up?".

For a specific person:

* तू काय करत आहेस? (Tu kay karat ahes?) - This is used for "you" in the singular form.

Remember that the choice of phrase depends on the situation and your relationship with the person you are speaking to.