Formal:
* Neevu nanannu vivaaha maadalu? (ನೀವು ನನ್ನನ್ನು ವಿವಾಹ ಮಾಡಲು?) - This is a more formal way to ask, literally translating to "Will you marry me?"
* Neevu nanage vivaaha maadalu? (ನೀವು ನನಗೆ ವಿವಾಹ ಮಾಡಲು?) - This is another formal way to ask, meaning "Will you marry me?"
Informal:
* Neevu nanannu marry maadalu? (ನೀವು ನನ್ನನ್ನು ಮ್ಯಾರೀ ಮಾಡಲು?) - This is a more informal way to ask, using the English word "marry."
* Neevu nanage marry maadalu? (ನೀವು ನನಗೆ ಮ್ಯಾರೀ ಮಾಡಲು?) - This is another informal way to ask, using the English word "marry."
Romantic:
* Neevu nanu ondu jeevana sahayogi aaguttiddira? (ನೀವು ನಾನು ಒಂದು ಜೀವನ ಸಹಯೋಗಿ ಆಗುತ್ತಿದ್ದೀರಾ?) - This means "Will you be my life partner?" and is a more romantic way to ask.
Note: Kannada has different levels of formality, so choose the appropriate phrase based on your relationship with the person you are asking.