How can the English language continue to be used for official purposes in a State after the adoption of another language?
According to the context provided, the English language can continue to be used for official purposes in a State after the adoption of another language only if the Legislature of that State has not yet passed a law to change the language being used. Until such a law is passed by the State's Legislature, the English language will continue to be utilized for all those official purposes within the State which it was being used immediately before the commencement of the Indian Constitution.