  In this work, He's semi-inverse variation method and the ansatz method with
the conformable time-fractional derivative are used to construct the soliton
solutions for time-fractional Korteweg-de Vries equation, time-fractional equal
width equation, and time-fractional modified equal width equation. These
equations are transformed to some other non-linear differential equations by
travelling wave transformations and then the methods mentioned above are
applied to find the soliton solutions. Some soliton solutions are also shown
graphically to explain their physical parameters.
