1) I will have to work more to have better results.
2) She doesn't have to be home by 11pm on Saturday.
3) Smoking is prohibited here.
4) You better go home, the storm is coming.
5) I didn't need to buy the DVD, it was burned to me.
6) She should change her hairstyle, it doesn't suit her at all.
7) They had to amputate his leg because the injury was too bad.
8) I can come and help you if you want.