My friend went to Shanghai last Monday.He could not understand their dialect.But,they could speak Mandarin.However,sometimes,it was hard to understand their Mandarin.My friend's last name was Wang.His friend's last name was Huang.But Shanghai people had the same pronunciation for Wang and Huang.So,when they called my friends,my friends did not know who they were calling.However,most time,they could understand each other very well.In fact,my friend had learned some Shanghai dialect when he was there.He was happy there and he will go there again.