used when you are expressing thanks or asking politely for something, to show that you are grateful to somebody 感激；感谢 I'd be obliged if you would keep this to yourself. 如蒙保守这个秘密，我将感激不尽。 🔊🔊 - obliged to somebody for (doing) something
I'm much obliged to you for helping us. 承蒙相助，本人不胜感激。 🔊🔊 - obliged to somebody
Thank you. We are very much obliged to you. 谢谢。我们对您非常有义务。