“保证人”的英语？

一位富商为他做了保证人.A wealthy businessman has stood bail for him.如果我向银行借一万美元, 你愿意作我的保证人 吗 ?If I try to borrow $ 10 , 000 from the bank, will you be my guarantee?双方都必须有保证人.Both parties had to find sureties....