Question! :) Hi guys, I have a question for you.. in english is there another way to say I can't do it ? Thank you!

First notebook! Hi everyone! I'm Federico I'm Italian and i really want to learn english, I think it's very important to speak two or more language. I have studying English just one year in a high school and now i forgot a lot of words. I hope to meet new people here and to teach my language! Have a good day guys! And please..Correct me :D