  We calculate the most general terms for arbitrary Lagrangians of twisted
chiral superfields in 2D (2,2) supersymmetric theories [1]. The scalar and
fermion kinetic terms and interactions are given explicitly. We define a set of
twisted superspace coordinates, which allows to obtain Lagrangian terms for
generic K\"ahler potential and generic twisted superpotential; this is done in
analogy to the corresponding chiral superfields calculations [2]. As examples
we obtain the Lagrangian of a single twisted superfield, i.e. the Abelian-dual
of the gauged linear sigma model (GLSM) of a single chiral superfield, and the
Lagrangian for the non-Abelian SU(2) dual of the $\mathbb{CP}^1$ GLSM model.
Generic Lagrangians contain both twisted-chiral and chiral superfields, with
distinct representations. We write down the kinetic terms for all bosons and
fermions as well as their interactions for these generic cases. As twisted
superfields play a central role for T-dualities and Mirror Symmetry in GLSMs,
we expect the pedagogical exposition of this techniques to be useful in those
studies.
