Question

list two functions of the cytoskeleton

Answer 1

It maintains cell shape and assists movement of cell parts
It also provide stability of the shape

(I am studying that right now :D)

Answer 2

As its name implies, the cytoskeleton helps to maintain cell shape. But the primary importance of the cytoskeleton is in cell motility. The internal movement of cell organelles, as well as cell locomotion and muscle fiber contraction could not take place without the cytoskeleton.
The cytoskeleton is an organized network of three primary protein filaments: microtubules, actin filaments, and intermediate fibers.

Source http://www.cellsalive.com/cells/cytoskel.htm