reflexive, symetric,transitive - examples?

Hello,

I was wondering if someone could help me with this problem:

A relation on set can be reflexive (R), symmetric (S) or transitive(T) (..of course :) ) Depending on which of these ''basic characteristics'' it has, there are 8 options:

1. R, S, T

2.only R

3.only S

4.only T

5. R,S

6.R,T

7.S,T

8. neither R nor S nor T

I have to find an example for each option. I guess it's very easy, but somehow I have difficulties finding them, especially the ones that have only one characteristic. The first one I have of course : ) Any help is appreciated!