Which popular, though grammatically or logically incorrect, variants do you often hear in everyday conversations?

@DunningKruger did you know they're actually part of the lessons in English books us foreigners study

@DunningKruger Honestly. My in casual conversation, I lapse into those pronounciations, people do it where I live.

Like we pronounce Toronto as Tronno

@DunningKruger Because I use dictation very often on here, I am afraid that occasionally contractions like those which you mentioned creep in and I don't bother to correct them. I would never allow that in formal communication. In fact, in dictating this 'in formal' was reproduced as 'informal'. It may be artificial, but it's certainly not intelligent.

@FreddieUK I often write here and to my family in my vernacular.