可签的地方蛮多的。比如:

来源: 于 2010-09-29 13:25:58 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

别人申请英国护照/国籍，有一项是ask witness to testify的，你就可以签；

让我想想，还可以在Copy件上( such as marriage certificate, birth certificate)签名,证实这是原件的copy, and还有你认识此人，etc.

I used to sign quite a few for my colleagues when I was working.