I can modify pronouns to stand for omitted words in a comparasion

today i learned how to use or change me to I he to him or she to her. It is really important to pay attention to the different ways there is to write a sentance if you write me is smart , that dont make sence and a better way to write it is I am smart. It is important to know what kind of words to use in your sentence so they can make sence.