Step 1. We draw a rectangle and we divide it on the middle perpendicular straight lines, horizontally we draw one more straight line located the middle of the lower half of a rectangle are slightly higher. Then sideways we draw on a rectangle, then we draw the top part of a sofa.
Step 2. We draw sofa seats.
Step 3. We draw lateral part of a sofa.
Step 4. We erase lines that the sofa turned out as on the picture.