In this autocad tutorial you’ll learn how to pattern object in rectangle order.
1. Open a new drawing. Click New 
2. Make sure Ortho mode is ON, (it ON when it glow in blue)
click the icon to turn it ON or OFF. (or press F8 to toggle)
3. Type z [Space bar], e [Space bar]. This will zoom extents your drawing area.
4. Activate rectangle command. Click Rectangle.
5. Specify first corner point of the rectangle at 0,0. Type 0,0 [Enter].
6. Move your cursor to right side and specify other corner point at 1,1. Type 1,1 [Enter].
7. Select object to array, (rectangle)
Click Array tool,
Make sure Rectangle Array is selected, set row offset is 2 and set column offset 2. Click OK.
Done.
