Di,di...di,didididi,di...
Di,di...di,didididi,di...
Doo...
Di,di...di,didididi,di..
Di,di,di...di,di,di,
Dididi...didi,di,di...
...
The most important thing is the melody and rhythm; nobody cares what you are actually singing. That was how I learned to sing when I was young and that is how I am singing now. Similarly, that is how I sing in French, Italian, even indigenous languages.