I think most of us take pride in what we say on the Radio and mostly try to use correct phraseology HOWEVER if you misplace the occasional word or say "left" instead of "leaving" etc then by god it's no biggy, REALLY it's not.
As I said earlier it's all a matter of communication, does the other party understand what you are saying? If yes then
In Australia where we mostly speak good English to each other the occasional mistake/omission is easily fixed.
In places like India, China, Indonesia etc it is much more vital that standard calls are made because the locals will have no idea what you said AND probably won't confirm what you said, they'll most likely ignore it all together. THAT is a real safety problem.