Use "had better" to offer advice or suggestions or to say what one should do in a certain situation - in other words, what the sensible or smart thing to do would be. To say what one should not do, use "had better not."
Form it like this: had (or 'd) + better + base form of verb had (or 'd) + better not + base form of verb
The contractions (you'd better leave I I'd better leave) are much more common than the full forms (you had better leave / I had better leave).
Examples: ▶ You'd better finish your homework before going out tonight. ▶ You'd better not drive if it's snowing heavily. ▶ You'd better not ask your father for any more money. ▶ We'd better check the weather before we leave on our ski trip. ▶ I'd better call my wife so she knows I'll be home late. ▶ I'd better let you move the couch. I don't want to hurt my back. ▶ I'm on a diet. I'd better not have another cookie. ▶ It's already midnight? I'd better go to bed!
When speaking, people often leave out the word "had" (or the 'd): Examples: ▶ You better tum down that music! ▶ You better go to sleep now. ▶ You better start paying attention in class. ▶ We better buy your plane tickets today.
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