hadnt

Hadn't is a contraction of had not, and it serves as the negative form of the auxiliary had in the past perfect tense. In English, the past perfect describes an action that was completed before another past moment.

Form and pronunciation: The spelling is hadn't with an apostrophe between the d and the n (had + not). It is commonly pronounced as /ˈhædnt/, with the final t sound and a blending of the d and n in fluent speech.

Usage: Hadn't forms the negative of the past perfect: I hadn't seen the film before I read the review. It is used in both straightforward statements and in questions or negative clauses. Examples: We hadn't planned to go, but we changed our minds. Hadn't you finished by the time the meeting started?

Formal versus informal style: Contractions like hadn't are widespread in everyday speech and informal writing. In formal writing, many guides prefer the fully spelled "had not" to avoid contractions, especially in academic or technical contexts.

Related notes: The contraction belongs to a broader set of English negation contractions with other auxiliaries such as hasn't (has not) and haven't (have not). While all convey negation, their precise use depends on tense, subject, and the intended level of formality.