The vernacular language is Shanghainese, a dialect of Wu Chinese; while the official language is Standard Mandarin. The local dialect is mutually unintelligible with Mandarin, and is an inseparable part of the Shanghainese identity. The Shanghainese dialect today is a mixture of standard Wu Chinese as spoken in Suzhou, with the dialects of Ningbo and other nearby regions whose peoples have migrated to Shanghai in large numbers since the 20th Century.

 

Nearly all Shanghainese under the age of 40 can speak Mandarin fluently. Fluency in foreign languages is unevenly distributed. Most senior residents who received a university education before the revolution, and those who worked in foreign enterprises, can speak English. Those under the age of 26 have had contact with English since primary school, as English is taught as a mandatory course starting at Grade 1. (wikipedia.org)