Is my homework of english, i need identify the incorrect word and write them correctly

Dear Students,

When you are writing something for my class, be sure that you are using the right homophones. I cannot tell you enough how unintelligent you look when you use the wrong word. There are no excuses for using the wrong words cause you have the education to know better. You're smart enough to know the differences but you rush through your work and mess up. I know I've been saying this for a long time.

                                   Love, your concerned teacher.

I edited this for all corrections and put those corrections in bold. I hope this helps! =^-^=

c. to depict the cunningness of the federal soldiers