  We consider a general scalar-tensor theory of gravity and review briefly
different forms it can be presented (different conformal frames and scalar
field parametrizations). We investigate the conditions under which its field
equations and the parametrized post-Newtonian parameters coincide with those of
general relativity. We demonstrate that these so-called limits of general
relativity are independent of the parametrization of the scalar field, although
the transformation between scalar fields may be singular at the corresponding
value of the scalar field. In particular, the limit of general relativity can
equivalently be determined and investigated in the commonly used Jordan and
Einstein frames.
