Had better
Incorrect : You better go home now.
Correct : You had better go home now.
Note: "Had better' can be treated as a modal followed by a bare infinitive. It is a common expression in conversation to give firm advice about what a person should do, especially to avoid some problem or danger. ‘You had better go’ means "It would be a good thing for you to go." In American English, "Would better’ is used for ‘had better’.
