The rules of pronunciation are usually vague with lots of exceptions. I think when we have tt (double t) between vowels the tt is pronounced /d/ however I don't know whether the rule is only for one syllable words or that could be general.
exs: bottle, written, cattle, etc.
This will vary regionally. I would agree that my "cattle" and "bottle" sound like d's. But not my "written."
As Soothing Dave said, it's regional. I agree with bhaisahab that in BrE all your examples would have the "t" sound in the middle. In AmE, "bottle" and "cattle" can sound like "boddle" and "caddle".
So there is no such rule in English. But if you know any other similar rule about 'tt' please mention (although that wouldn't be a hundred percent correct)
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The one scenario you need to worry about: VttVn, where the first V is stressed. In this case, t is nasally released: for instance, Man'hattan, Har'mattan 'rotten, 'smitten, 'button, 'cotton, 'glutton, 'Trenton (NJ), 'Barton, 'Scranton (PA)
'Fullerton (CA): t can be flapped or unaspirated and orally released.
Last edited by raindoctor; 18-Apr-2012 at 19:56.