When used in as to why, how whether etc., it is often better to drop as to and simply use why, how, whether Why that happens is a little complicated, and requires unpacking some assumptions in your question For example, i don't understand as to why you are going there
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An Introduction to 5-why | Karn G. Bulsuk: Full Speed Ahead
I don't know as to.
You never know, which is why.
And goes on to explain There is a subtle but important difference between the use of that and which in a sentence, and it has. Why is [etc.] is a question form in english Why is the sky blue
Why is it that children require so much attention Why is it [or some thing] like that For why (also hyphenated or written as one word) meaning why as a direct interrogative was used in old and middle english (see the med's entry), but it became obsolete. There are also many examples of why we cannot, but they are not interrogatives

Jforrest explains that 'cannot' is the negative form of 'can', and so 'cannot' should be placed in.
See also why does zzz mean sleep The reason zzz came into being is that the comic strip artists just couldn’t represent sleeping with much


