  We investigate $N=2$ extended superconformal symmetry, using the half-twisted
Landau-Ginzburg models. The first example is the $D_{2n+2}$ -type minimal
model. It has been conjectured that this model has a spin $n$ super $W$
current. We checked this by the direct computations of the BRS cohomology class
up to $n=4$. We observe for $n\le 3$ the super W currents generate the ring
isomorphic to the chiral ring of the model with respect to the classical
product. We thus conjecture that this isomorphism holds for any $n$. The next
example is $ CP_{n}$ coset model. In this case we find a sort of Miura
transformation which gives the simple formula for the super W currents of spin
\{1,2,...,n\} in terms of the chiral superfields. Explicit form of the super W
currents and their Poisson brackets are obtained for $CP_{2},CP_{3}$ case. We
also conjecture that as long as the classical product is concerned, these super
W currents generate the ring isomorphic to the chiral ring of the model and
this is checked for $CP_2$ model.
