Some of the prescriptive rules that I was taught in my life is that you can not use a double negative because it is “improper” and “doesn’t make sense”. I have also been told that you cant use the word “aint” because it “isn’t a word” and it is “improper”. Another example is the word “gonna.” I actually use this word all the time when I am speaking but I am not allowed to use it on paper or in text because I have been told that it isn’t a word and it is improper. This also goes for the words, “gimme, lemme, and kinda. This did not cause me to stop using these forms in my everyday life but I don’t use them when writing an essay or writing something formal. I will only use it in quotes if I am typing out something that someone said.