If it weren't a thread entitled english presentation, id never correct it. If and when you are done with your powerpoint, I can check it over if you want me to
Since this is English class..
"I would" is always abbreviated to I'd (with a capital I), not id.
Regarding grammar, you should have said: "I'd never have corrected it", since your sentence refers to a past event which has already happened, instead of an event which still has to happen.