By allowing the spin degrees of freedom, we present a generalized spinallowed $U(1)\times U(1)$ Chern-Simons theory of fractional quantum Halleffects for odd and even denominator filling factors in single layers. Thistheory is shown to reproduce all possible odd denominator filling factorscorresponding to spin-unpolarized, partially polarized, and fully polarizedfractional quantum Hall states. Closely following our earlier theory, we derivethe formal expressions of electromagnetic polarization tensors and Hallconductivity for the spin-unpolarized and partially polarized fractionalquantum Hall states. Finally we report the computed spectra of collectiveexcitations for both the even and odd denominator filling factors for whichKohn's theorem is satisfied.
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