Have to hoặc has to
-You have to learn harder
-You have to go to school on time
-He has to do homework
-She has to read books
-She has to try to learn
don't have to và doesn't have to
-You don't have to drink soft drink
-You don't have to go to shool late
-You don't have to drink wine and drive.
-He doesn't has to worry about them
-He doesn't has to spend much time to play computer games