some examples about prescriptive grammar usage
Never split infinitives e.g. *to boldly goOriginally Posted by sersevay
Never use double negatives e.g. *I can't get no satisfaction.
Never end a sentence with a preposition e.g., *This is the topic I will be writing my paper on.
Never use "me" after "than" e.g., *She is taller than me.
Contrasting prescriptive and descriptive rules: Click Here.
All the best, :D