  In this communication we consider the widely used nonlinear Fokas-Lenells
equation, the cubic focussing nonlinear Schr\"{o}dinger equation in
(2+1)-dimensions and the coupled Drinfel'd-Sokolov-Wilson equation and attempt
to construct almost general solutions for the envelope of the wave packet by
means of the travelling wave ansatz. The obtained solutions have been expressed
in terms of Jacobi elliptic sine function from which one can obtain the
solitary wave (particular) solutions by imposing appropriate conditions on the
roots of certain quartic polynomials.
