I promise to arrive on time.

我保证按时到。

youdao

I promise to return the book to you as soon as I finish reading it.

我承诺一读完这本书我就把它还给你。

youdao

I promise to pay you back.

我保证还你钱。

youdao

"Johnsy,dear," said Sue, "will you promise me to keep your eyes closed, and not look out the window until I am done working?

VOA: special.2009.08.01

So, the goldsmith would sign his name on it saying, I promise to give so many ounces of gold.

所以这个金匠会在票据上签名,保证归还多少盎司的金子

耶鲁公开课 - 金融市场课程节选

Suppose you are a naive investor and you say, okay I'm going to invest in companies' paper, which is their promise to pay --their IOU.

假如你是一个菜鸟投资者,想投资于这些公司的债券,债券就是他们的偿还凭证或者说欠条

耶鲁公开课 - 金融市场课程节选

But I promise to never let your memory die and I will make you proud to be my brother.

FORBES: An Irreplaceable Casualty of the Storm: In Loving Memory of Tony Laino

As your mother, I promise to you now, that I will be there by your side to support you.

CNN: Suspect in Canada killings caught at the border

"I promise to tell the truth about every minute of what I went through, " said Manchester United defender Evra.

BBC: World Cup 2010: Domenech snubs Parreira handshake