Using 'Had better'
I had better ('it would be a good idea if I', 'it would be better for me to') is used as a modal auxiliary verb:
I had (or I'd) better sleep now. It would be a good idea for me to sleep now.
You'd better discuss this issue with Bruno. You should discuss this issue with Bruno.
We'd better leave before the police come. Let's leave before the police come.
He'd better not come. It would be a bad idea for him to come.
Had better is always followed by a verb in the infinitive without 'to':
You had better BE on time. You must or should be on time.
Had better is ALWAYS formed from the auxiliary verb 'have' in the past simple ('has better' or 'will have better' do not exist!).
She had better be ready for next week's meeting. She really must be ready for next week's meeting.
In informal English, we sometimes say I had best, used with the same meaning:
I'd best go home. It would be good for me to go home.
You'd best listen to what he has to say. It would be a good idea for you to listen to what he has to say.
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