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忘れてて良いのに

I understand this as: "You should forget about it"

But what does のに do?

Tyler H
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2 Answers2

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のに is a conjunction that corresponds to "even though ～" or "despite ～".

(clause A)のに(clause B) = although A, B.

Unlike けど, it often (but not always) is followed by something regrettable/disappointing. Examples on JGram.

The latter clause is often omitted, and it implies the reality is something regrettable and contrary to the Clause A.

～のに。 = although ～, (something contrary), A, but..., I wish ～.

So 忘れてて良いのに means "You could have left it (although, in reality, you recalled and mentioned it)".

Examples:

  • こんなに美味しいのに。 It's really delicious (and I wonder why you don't want to eat it)!
  • そんなに賢いのに。 You are such a smart boy (and I don't understand why you did such a silly thing)!
  • もっと頑張れば良かったのに。 You should have worked harder.
  • 空を飛べたらいいのに。 I wish I could fly.

See also:

Community
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naruto
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I can suppose the following situation.

A helped B out of his (her) hard situation.

B is one of the best A's friends, and A wants to be kind without being patronizing.

However, every time when B meets A, B shows his (her) thanks.

Then A says "忘れていいのに"

The full sentence could be "まだあなたは感謝を忘れないんですね。私は忘れていいと思っているのに（どうぞ忘れてください）。" = "You still owe a huge debt to it、but I sincerely want have you forget it."

"忘れていいのに・・・" implys such nuans.

Sonny365 TANAKA
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    あなたの一つ前の回答のところで既に「わかりました、迷惑ならやめます」とコメントさせていただき、同時に今までのあなたの回答へのEdit（私による編集が最新のもののみですが）を全てRollback(元に戻す)させていただきましたが、まだいけないでしょうか。。。ところで「せいをだす」は「 勢を出す」じゃなくて「 精を出す」です・・・ – chocolate Jan 10 '17 at 09:05
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    ①Editを拒否する姿勢はこのサイトの基本方針に反します。②何にせよPSにあるような議論はmeta siteかチャットでやるべきです。 – naruto Jan 10 '17 at 12:49