It also seems to me that, unlike other "wh"- words, "why" has some time restrictions (the reason expressed by the infinitive and the main verb usually need to be contemporary). Thus, while we can have:
- No one knows (now) where/how to go tomorrow. - No one knew (yesterday) who to ask today. - No one knows (now) what to do tomorrow. - We have not yet decided when to go swimming.
"why" seems to be only suitable with certain verbs and tenses to convey simultaneity:
- You should explain to him (now) why to quit smoking (why it is advisable for him to quit smoking). - There’s no real need to explain why to go here. (It isn't really necessary to explain why going there is a must.)
While the "to"- infinitive can express futurity with most "wh"- words, it cannot with "why," and this makes this combination the least productive.
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