  Processes of electron-positron annihilation into a pair of fermions were
considered. Forward-backward and left-right asymmetries were studied, taking
into account polarization of initial and final particles. Complete 1-loop
electroweak radiative corrections were included. A wide energy range including
the $Z$ boson peak and higher energies relevant for future $e^+e^-$ colliders
was covered. Sensitivity of observable asymmetries to the electroweak mixing
angle and fermion weak coupling was discussed.
