あんなにto that extent, to that degree, so much

あんなに勉強(べんきょう)したのに…

Despite having studied that much...

あんなに冷(つめ)たい人(ひと)を見(み)た事(こと)がない。

I have never met a person that cold.

先生(せんせい)：「あんなに忘(わす)れ物(もの)をしないでくださいと言(い)ったのに…！！」

Teacher: 'Despite that I said please don't forget things that much!!'

あんなに優(やさ)しい人(ひと)はこの世界(せかい)に彼女(かのじょ)だけだと思(おも)います。

People that are that nice, I think that she is the only one in this world.

あんなに貧乏(びんぼう)だった藤木(ふじき)君(くん)がビリオネアになるのだから、人生(じんせい)は分(わ)かりません。

Since Fujiki-kun who was that poor is becoming a billionaire, I really don't understand life.