The polymorph description states that if that if you are capable of making somatic and verbal components, like a dragon, you can cast spells in your new form...
Elementals can speak, and I have eschew materials as an elemental bloodline sorcerer, however it's rather vague on the shape you take I am already part elemental from my bloodline and wish to keep the same form - only made up of wind and smoke (as an air elemental).
Is this reasonable and can I cast spells without natural spell?