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Idiom NOT x BUT y ... don't fully understand parallelism

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nonameee
 Post subject: Idiom NOT x BUT y ... don't fully understand parallelism
 Post Posted: Tue Nov 15, 2011 6:16 am 
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Students


Posts: 68
Quote:
The idiom is "not X but Y". You are not allowed to insert an "are" in this idiom.


post51774.html#p51774

Can someone please explain why you are not allowed to insert an 'are' in this idiom?

Here's an example:

Headache is not caused by x or y, but is by z (x,y,z are some nouns).

Why 'is' is not allowed here? I think that this structure maintains parallelism:

NOT verb by noun or noun, BUT verb by noun

Please explain.

Thanks a lot.
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