Task: Question Generation
Input (English): Context : The Crewe and Nantwich by-election, 2008 was a parliamentary by-election held on 22 May 2008, for the British House of Commons constituency of Crewe and Nantwich, in Cheshire, England. 
Answer : 22 May 2008
Output (English): The point in time of Crewe and Nantwich by-election, 2008 was when?