You have my word
我向你保證
I am sorry. I don’t mean it. You have my word. I won’t do it again.
對不起，我不是成心的。我想你保證，我再也不會那樣了。
The work will be finished by the end of this week. You have my word!
這項工作一定會在周末之前完成，我向你保證。

I give you my word
我向你保證
I give you my word (that) I'll go.
我向你保證，我會去的。

A: Do you think you could do me a favor with this price?
這個價格還可以再優惠點嗎？
B: Oh, of course......You know, normally we retail that for $29, but since you are such a good customer of ours, we will give you a discount. How's about 3% off? That's a higher discount than I give almost all of our customers.
當然可以，你知道我們通常的零售價是29美元，既然你是我們忠實客戶，我們愿意給你打折，九七折怎么樣。這是幾乎所有顧客中我給的最高折扣
A: Thanks! Does it come with insurance?
謝謝。含保險嗎？
B: I'm sorry, I really wish I could do that for you, but our policy is to sell it without the insurance. If you would like to purchase that separately, I can give you a real deal on it.
很抱歉，我真的希望我能這么做。但我們的政策是所賣商品不帶保險費，如果你想單獨買商品的話，我可以給你實在的價格。
A: That's okay. I'd like to look at some of the different models.
那樣也可以，我想看看其他不同的款式。
B: Oh! Yes. Take a look at this one. This is not usually available, we keep it behind the counter because it is limited edition. Of course, I know you're such a good friend, so I can let you have it at base rate.
好的，看一下這個，這是不常見到的，因為是限量版，我們藏在柜臺后面，當然我們是老朋友了，所以我就賣給你最低價吧。
A: Does it have a guarantee?
有質量保證嗎？
B: For you, I'll guarantee it personally! You have my word on it.
對你，我以個人名義擔保！你可以相信我的話。