This is actually a surprisingly good way of getting the point across. If my teachers in school were able to describe it this way I probably would have grasped

This is actually a surprisingly good way of getting the point across. If my teachers in school were able to describe it this way I probably would have grasped it even faster. That being said, I don't think most grammar mistakes are made out of stupidity, rather carelessness. I've accidentally dropped a "they're" instead of a "their" knowing very well which one was correct, and when I go back to correct it, I often wonder how it even happened, or what I was thinking that allowed the wrong one to slip in. ... That's all I have to say, but I'd like to note that I don't think you're supposed to end a sentence with the preposition word "in" ...