
Please back up any arguments you make with links to books or mechanics. If you are going to post and state your opinion, feel free to do so, but do not use it as a crutch for the debate.
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As per; http://archive.wizards.com/default.asp? ... /20040518a
What does this mean in terms of Elementals? To quote the SRD (http://www.d20srd.org/srd/monsters/elemental.htm); "Air elementals speak Auran, though they rarely choose to do so."You retain your ability to speak if your assumed form has that ability.
Speech is a natural ability (see Part One); however speech has a mental aspect (your brain's ability to handle language) and a physical aspect (working vocal apparatus). You have to have both to speak in an assumed form. Furthermore, your assumed form must be able to speak naturally. If you assume the form of a creature that cannot speak or use language during the normal course of its life, you still lose the ability to speak. This distinction doesn't often come up with the alter self spell (because it doesn't let you assume a form with a type different than your own), but it can with other polymorph effects.
This clearly says that Air Elementals can speak Auran. As beings of the Plane of Air, they would not be visiting the Material Plane to learn Common. Auran is Common to them, so to speak. Due to the fact that they can speak, as per the ruling from Wizards of the Coast, should a Polymorphed Wizard or Wildshaped Druid assume Elemental Form, they would be able to speak any language they know due to their own 'Mental Aspect' and the physical form of the elemental already being able to speak a language.
If the chosen form cannot speak ANY language, then the chosen Polymorphed/Wildshaped form CANNOT speak either.
The Revisted Polymorph section went into some detail about Wildshaping Druids in Animal Form;
http://archive.wizards.com/default.asp? ... /20060523a
A druid loses her ability to speak while in animal form because she is limited to the sounds that a normal, untrained animal can make, but she can communicate normally with other animals of the same general grouping as her new form. (The normal sound a wild parrot makes is a squawk, so changing to this form does not permit speech.)