1- I can play the piano.
2- I can`t dance.
3- May I help you?
4- I need to go to the hospital.
5- You should study every day.
6- I don`t have money to buy a car
7- I have to read a book
8- You don`t have to eat so much.
9- I must to work tomorrow
10- I mustn't work tomorrow
11- She needn't speak to loud
12- I could to see my mother?