  We study large top quark mass effects on low energy physics in the chiral
Lagrangian formulated electroweak theories. We show that these radiative
corrections can be easily obtained from a set of Feynman diagrams involving
only the scalar Goldstone bosons and the fermions when the contributions of the
order $g$ (the weak coupling) are ignored. Using CERN LEP and SLAC Linear
Collider (SLC) data we constrain on the nonstandard couplings, which might
originate from the spontaneous symmetry-breaking sector, of the top quark to
the electroweak gauge bosons.
