Yep - have at look at the following for basic terms:
http://forum.enjoysudoku.com/viewtopic.php?t=2Animator has recently described "pairs" in another post:
http://forum.enjoysudoku.com/viewtopic.php?t=496So, look at box 5 and find 2 cells that can only have 2 numbers....this means there cannot be any other numbers in those cells....
Once you have found these 2 numbers/cells, look to see where the other numbers can go.....