Sentence examples for had better do from inspiring English sources

"had better do" is a correct and commonly used phrase in written English.
It is typically used to indicate a strong suggestion or advice to do something. It can also imply a potential negative consequence or risk if the action is not taken. Example: "You had better do your homework before you go out with your friends." In this sentence, the phrase "had better do" conveys a strong urging to complete the homework as soon as possible, possibly because there may be consequences (e.g. getting a bad grade) if it is not done.