1. "ನೀವು ನಿನ್ನೆ ಏನು ಮಾಡಿದಿರಿ?" (neevu ninne enu maadidiri?)
* This is the most common and direct way to ask "what did you do yesterday?".
* neevu (you)
* ninne (yesterday)
* enu (what)
* maadidiri (did)
2. "ನೀವು ನಿನ್ನೆ ಏನು ಮಾಡ್ತಿದ್ರಿ?" (neevu ninne enu maattidri?)
* This is a more informal way to ask "what did you do yesterday?". It implies that the person was busy or doing something specific.
* neevu (you)
* ninne (yesterday)
* enu (what)
* maattidri (were doing)
3. "ನಿನ್ನೆ ಏನಾಯ್ತು?" (ninne enaytu?)
* This translates to "what happened yesterday?". It is used to ask about something that happened in the past.
* ninne (yesterday)
* enaytu (what happened)
You can choose the appropriate phrase based on the context and formality of the situation.