Mümkünse, neden olmasın?
- If it's possible, why not?
Emin misin? Neden olmasın?
- Are you sure? Why not?
Let's have pizza for lunch. — Yes, why not?.
I don't want to go out today. — Why not?.
Why not try turning the handle in the other direction to see if that opens the window?.
... with Android, to write apps for new classes of hardware, and why not? Even create their ...
... Why not? ...