But no.As in every census, some people just don't reply and illegal immigrants mostly avoid census-takers.

VOA: standard.2010.02.03

Don't remember is a good reply if you're auditioning to be the Attorney General, but it's not such a good reply. Anybody?

如果你是司法部长的话,我忘了是一个很不错的借口,可惜这里不是这样的,谁来回答

耶鲁公开课 - 博弈论课程节选

and they reply in German, "Yes, I'm French," that doesn't--language doesn't necessarily tell you how people feel about their identity. Some sage once said, I don't know who it was, but I love this expression, that a language is a dialect with a powerful army.

然后他们用德语回答,"我是法国人",不一定--语言不一定能代表,对自己的身份认同,有个哲人说过,我忘了是谁,但我特喜欢这句,说语言就是有强大军队撑腰的方言

耶鲁公开课 - 1871年后的法国课程节选