Hadn't is the short, spoken form of had not. We use it with a past participle: She hadn't seen the film.

Hadn't Hadn't is是 had not had not 的 the short, spoken form口語縮短形。 We我們 use it把它 with a past participle和過去分詞連用： She hadn't seen the film. She hadn't seen the film.（她那時還沒看過那部電影。）

That is the past perfect — you are standing in the past and looking at something even earlier. I hadn't eaten all day means: before that moment, I had not eaten.

That那 is是 the past perfect過去完成式 — you你 are standing站在 in the past過去， and looking at回頭看 something even earlier更早的事。 I hadn't eaten all day I hadn't eaten all day means意思是： before that moment在那個時刻之前， I我 had not eaten還沒吃過東西。

In writing, the apostrophe stands in for the missing o in not. You will hear hadn't all the time in speech and informal writing.

In writing在書寫裡， the apostrophe撇號 stands in for代替的是 not not 裡 the missing o不見的那個 o。 You你 in speech and informal writing在口語和非正式文字裡 all the time會一直 will hear聽到 hadn't hadn't。

Though actually, in casual talk some people say hadn't where a textbook would want didn't or haven't, because all three feel like “not have.” They are not the same. Haven't is present perfect (up to now). Didn't is ordinary past. Hadn't is the “before then” one.

Though actually不過其實， in casual talk隨口聊天時 some people有些人 where a textbook would want didn't or haven't會在課本想要 didn't 或 haven't 的地方 say hadn't說 hadn't， because因為 all three三個 feel like "not have"感覺都像「沒有」。 They are not the same它們並不一樣。 Haven't Haven't is是 present perfect現在完成式 (up to now)（到現在為止）。 Didn't Didn't is是 ordinary past一般的過去式。 Hadn't Hadn't is是 the "before then" one「在那之前」的那一個。