Venn Diagram? probability question

i have a simple/stupid question about venn diagram that i am having extreme difficulty to understand for some unknown reason.
What (EXACTLY) (EXACTLY) are those: please explain properly & clearly
AUB
A∩B
A'UB
A'∩B

Here is a diagram showing:
A (everything in A)
B (everything in B)
A' (everything not in A)
B' (everything not in B)
The appropriate regions are shaded
http://i41.tinypic.com/16m7rz8.png

Here is a diagram showing
A U B (A union B = everything that's either in A or B or both)
A ∩ B (A intersect = everything that's in both A and B)
A' U B ((not A) union B)
A' ∩ B ((not A) intersect B)
http://i43.tinypic.com/eaiced.png

Mαthmφm