To teach days and concepts "yesterday, today, and tommorrow", it's a good idea to use flashcards of days and put them up on the noticeboard in class. I prepared my own flashcards. Each of them includes the image of a different lovely teddy bear on which a day is written. We also have three caps,each of which presents 'Yesterday, Today or Tomorrow'. We put these caps over the teddy bears relating those days. We change the caps everyday. My students learnt Days of the Week within a short time, and they love changing them.

 
Here, you can find an image showing the flashcards I prepared.

http://hayriyeulastaraf.blogspot.com/2011/02/teaching-days-of-week.html