Perspective drawing is a technique used to create depth in a 2D drawing. A perspective drawing has a vanishing point, a horizon line, and orthogonal (parallel) lines.
The steps to create a simple 1 point perspective drawing are:
Using a ruler, draw your horizon line around the middle of the page.
Place your vanishing point aroudn the center of the horizon line.
Draw the front of your shapes - a square, a circle, and a triangle.
Using a straight-edge begin lightly drawing your orthogonal lines. Every one of these should lead back to the vanishing point.
Draw vertical or horizontal lines to define the other sides of your shapes.