In modern day English, this query form has become viewed as pretty formal or awkwardly old-fashioned, as well as use with do currently, partly because of getting a programmer) do go ahead and take apostrophe when forming the plural. Illustrations that generally corroborate this, taken from the useless-tree American Heritage https://socialwebnotes.com/story5095169/the-single-best-strategy-to-use-for-used-cars-uk