The Negative Form I Had Better, We Had Better

The negative form is had better plus not. Or you could use the short version of had apostrophe D, better not. The infinitive without two for the negative is add the word not before the verb. To make the question form, if you want to ask a question we've had better, you need to invert the subject and then change the position to make it opposite. For example, had I better speak to the boss before I send this email?