Had better

From Teflpedia

Had better, often contracted to 'd better is a semi-modal verb phrase in English, with some usage notes[1]:

  • You had better do something
  • Had you better do something?
  • You had better not do something!
  • Had you better not do something?
  • https://dictionary.cambridge.org/grammar/british-grammar/modals-and-modality/had-better