Normal Forms and BCNF

Hi,
I am a little confused with Normal Forms and BCNF. I have some relations and I am trying to determine it's normal form. I also need to decompose it to BCNF forms...Any help would be appreciated.

Here are some of the relations:

1. R(A, B, C, D)		where		A -> B
						B -> C, D
2. R(A, B, C, D)		where		A,B -> C
						B -> D
3. R(A, B, C, D, E)		where		B,C-> E
						A, B, C -> D
4. R(A, B, C, D)		where		A -> B
						C,D ->  A
5. R(A, B, C, D, E, F)		where		A -> C, D
						B -> E
6. R(A, B, C, D, E) 		where		A -> B, C, D
						C -> D
						B -> E