Modals can be used for giving advice. Should, ought to, and had better are used for giving advice. Should and ought to are basically the same in meaning however useage varies. Ought to is typically used to describe moral obligations and duty whereas should is typically used for general advice.
Shouldn't, or should not, is negative for either ought to or should.
Had better is similiar to should and ought to. It is different because typically it implies some sort of action or negative consequence if it is not followed.
Had better is contracted in spoken english with subject personal pronouns. 'pronoun'd better'
The negative form of had better is had better not.
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