Depreciation question

[Stephen Race]

Does the basis for depreciation change each year if you have personal use (less than 10% of rented days)? For example, purchase price is $275. Depreciation is $10 / yr. with no personal use. If use 10% each yr, then depreciation claimed on tax return is $9/yr. For future years, does one adjust the basis, since the full depreciation amount was not claimed, or do you continue with original basis and end up after 27.5 yrs with 10% of the original value not depreciated from a tax basis standpoint?