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?