Does this "should" have some special meaning? For young professionals, why should they want to work in a large commercial bank? What difference is there from just using "do"? ...
meaning - How is "why should" different from "why do"? - English ...
Possibly relevant to why /z/ won: if I try to pronounce axis with a /z/ instead of an /s/, it sounds hardly at all different. Someone with a better understanding of phonetics can probably explain why the contrast is so small in that context.
Why do word beginnings with X take a /z/ sound in English?
Why the long face? =What is the cause of your long face? Why so cheerful? =Why are you so sad? A 'bare' infinitival clause—that is, an infinitival unmarked with to . . . the construction has the sense "Why do you X?" or "Why would you X?", implying that there is a better alternative: Why wait? = Why would you wait (instead of doing it now)?
idioms - Are "why doing this" and "why to do this" correct? - English ...
Why do you ask (the question)? In the first case, Jane's expression makes "the answer" direct object predicate, in the second it makes "the question" direct object predicate; the subjects, being "I" and "you" respectively.
grammaticality - Is it ok to use "Why" as "Why do you ask?" - English ...
Why do you think that He doesn't know him from his schooldays means that he does know him? It would only have that sense if you added something like In fact, he first met him at university.