I'd be grateful if you kept this information to yourself.

你要是不把这消息传出去，我会不胜感激的。

《牛津词典》

I'd be grateful if you kept this news to yourself until he came back.

这事你如果能在他回来以前保密，我将不胜感激。

youdao

I'd be grateful if you kept this news to yourself until he came back.

这事你如果能在他回来以前保密，我将不胜感激。

youdao