  We revisit the scaling properties of the energy spectra in fully developed
incompressible homogeneous turbulence in forced magnetofluids (MHD) in three
dimensions (3D), which are believed to be characterised by {\em universal
scaling exponents} in the inertial range. Enumerating these universal scaling
exponents that characterise the energy spectra remains a theoretical challenge.
To study this, we set up a scaling analysis of the 3D MHD equations, driven by
large-scale external forces and with or without a mean magnetic field. We use
scaling arguments to bring out various scaling regimes for the energy spectra.
We obtain a variety of scaling in the inertial range, ranging from the
well-known Kolmogorov spectra in the isotropic 3D ordinary MHD to more complex
scaling in the anisotropic cases that depend on the magnitude of the mean
magnetic field. We further dwell on the possibility that the energy spectra
scales as $k^{-2}$ in the inertial range, where $k$ is a wavevector belonging
to the inertial range, and also speculate on unequal scaling by the kinetic and
magnetic energy spectra in the inertial range of isotropic 3D ordinary MHD. We
predict the possibilities of {\em scale-dependent anisotropy} and intriguing
{\em weak dynamic scaling} in the Hall MHD and electron MHD regimes of
anisotropic MHD turbulence. Our results can be tested in large scale
simulations and relevant laboratory-based and solar wind experiments.
