The constant motion of particles in a liquid does not cause it to take the shape of its container. Liquids are considered to be fluids, which means that they take the shape of their container. This is because the particles in a liquid are not bound together like they are in a solid, so they can move around and fill any available space.

The particles in a liquid are constantly moving and colliding with each other and the walls of the container. This causes the liquid to form a surface that is smooth and level, which matches the shape of the container.