  A large class of two-dimensional topological conformal field theories (TCFTs)
are obtained by the twisting construction of Witten and Eguchi-Yang. However
there seem to exist TCFTs which are not obtained in this way; for instance,
TCFTs obtained from the Kazama algebra and critical string theories with
generic background. We will show that by embedding the critical bosonic string
into the NSR string, its TCFT can indeed be obtained by twisting a N=2 SCFT. A
closer look at the construction of the N=2 superconformal algebra will show
that the embedding is not essential, and this will tell us how to generalise
this to other string theories. We thus conclude with the natural conjecture
that _all_ TCFTs have a description as topologically twisted N=2 SCFTs. (Talk
given at the Workshop on Strings, Gravity and Related Topics, held at the ICTP
(Trieste, Italy) on 29-30 June, 1995.)
