TAKOBOTO

But...! / But If (you) had just... / But (I) could have...
But if you had just asked, I would have given it to you.
～のに（残念、不満、非難）、〜が順当に成立していれば良かったのに、実際はそうではなかった

しってるのであれば、おしえてくれてもいいものを。

If you knew, why didn't you tell me!?

ひとでがたりなかったんですって？ちょっとれんらくしてくれれば、てつだってあげたものを。

You didn't have enough people? If you had just called me, I would have helped you.

インターネットでよやくすればかんたんにすむものを、かのじょはこくさいでんわをかけたんだって。

If she had just used the internet, she could have easily made the reservation, but she made an international call.

ほんとうのことをいえばいいものを、かれはうそをついてしんようをうしなってしまった。

He should have told the truth, but he lied and lost their trust.

すぐいしゃにみ（み）てもらったらかんたんになおっていたものを。ておくれになってしまった。

If I'd only gone to the doctor right away, I would have gotten better without any trouble. I acted too late.

ちちがこう１ねんいきていたくれたらわたしのけっこんしきにでてもらえたものを、わたしがぐずぐずしていたばかりに、ちちにわたしのはれすがたをみてももらえず、とてもざんねんです。

Had my father live one year longer, he could have attended my wedding ceremony, but just because I was indecisive for so long, I couldn't give him the chance to see me in my wedding dress. I feel so sorry!

かれはにほんごをつづけてべんきょうすればいいものを１ねんかんやっただけでやめてしまった。

It would have been better if he'd continued his Japanese studies, but he quit after only one year.

Verb(普通形) + ものを

This grammar is almost always in the form of 〜ば〜ものを。
Sometimes it becomes "もんを" in casual speech.

blabby

〜ものを：　（．．．だったら）〜のに　（実際は〜でなくて残念だという気持ち）
If only ... had.... , then....would..

誠

Ref # Kanzen Master Level 1 - p29 - no.32

LR

Ref # A Dictionary of Advanced Japanese Grammar p279

LR

Expressing the meaning of "although" with the speaker's strong feeling of discontent, regret, blame.
Similar usage to のに [noni]

LR

doesn't have to be 「~ば」before 「ものの」but does have to be a conditional clause 「~たら」is ok too.

LR

This can often be replaced with 〜のに
早く言えばよかったのに。
早く言えばよかったものを。

This is used to express the speakers moderate disappointment or regret.

blabby

Isn't ものを　always used with 〜た形?
Because, ものを is "but..." where something regrettable happened , and couldn't/almost impossible to be recovered from.

誠

So, i feel ex#5494 is better to be :
本当のことを言えばよかったものを、彼は嘘をついて信用を失ってしまった。or
彼は嘘をついて信用が失われてしまった。本当のことを言えばよかったものを。

誠

ex#5493　は同じです。
インタ−ネットで予約すれば簡単に済んだものを、彼女は国際電話をかけたんだって。or
彼女は国際電話をかけたんだって。インタ−ネットで予約すれば簡単に済んだものを。

誠

ex#5491 知ってるのであれば、教えてくれてもよかったものを。"If you had known, it would be OK even you told me."(But now it means not OK to the speaker since before this , the listener DIDN'T KNOW about that particular thing and told the speaker about it already.) Sounds strange to me, unless the speaker wanted it to be known to him at that particular time , in that case :
あの時知れば、教えてくれてもよかったものを。


Is better to say :
知ってるのであれば、教えてくれてよかったものを。or
(君が）知っていて教えてくれればよかったものを。"It would be nice if you had known and told me."

I think if you wanted to say :
" If you have known, why didn't you tell me?" (Of agony) : 知ってるのであれば、どうして教えてくれなかったのよ．．

"If you have known, isn't it ok to tell me?" : 知ってるのであれば、教えてくれてもいいんじゃない（か）。

誠

You have to keep in mind that ものを is not a conversational phrase, and it is predominantly literal diction.

bamboo4

I don't thinsk it always used with 〜た形。blabby's exmples are all natural to me.

Miki

Miki and blabby are right. It doesn't have to be 〜た形.

tmkain