  We study the form factors for semileptonic decays of $D$-mesons. That is, we
consider the matrix element of the weak left-handed quark current for the
transitions $D \rightarrow P$ and $D \rightarrow V$, where $P$ and $V$ are
light pseudoscalar or vector mesons, respectively. Our motivation to perform
the present study of these form factors are future calculations of non-leptonic
decay amplitudes.
  We consider the form factors within a class of chiral quark models.
Especially, we study how the Large Energy Effective Theory (LEET) limit works
for $D$-meson decays. Compared to previous work we also introduce light vector
mesons $V = \rho, K^*,...$ within chiral quark models. In order to determine
some of the parameters in our model, we use existing data and results based on
some other methods like lattice calculations, light-cone sum rules, and
heavy-light chiral perturbation theory. We also obtain some predictions within
our framework.
