I promise I'll pay you back. 我發(fā)誓,我肯定會(huì)還你的。
You can pay me back whenever you like. 你想什么時(shí)候還,就什么時(shí)候還。
I pay you back all the money you invested. 我會(huì)一分不差地把你投資的錢還給你。
You don't have to pay me back. 你不需要還我錢。
Do you promise to pay me back? 你發(fā)誓能還我錢嗎?
You have my word. 我保證。