"Yes,"shesaid."Ican'tfindtheexpirationdate."
BeforeIcouldstartmyfirstjobrightoutofcollege,IhadtopresentevidencethatIwasaU.S.citizen,soIbroughtadriver'slicenseandbirthcertificate.Theclerklookedatmydriver'slicenseandcopieddownsomeinformation.Shethenpickedupmybirthcertificateandgaveitagood,longlook."Issomethingwrong?"Ifinallyasked.
"Yes,"shesaid."Ican'tfindtheexpirationdate."
这是一个英语笑话,但是最后一句说明什么问题呢?