1.  right?;  isn't it?;  doesn't it?;  don't you?;  don't you think?
at sentence end; used as a request for confirmation or agreement
2.  hey;  say;  listen;  look;  come on
3.  you know;  you see;  I must say;  I should think
at sentence end; used to express one's thoughts or feelings
4.  will you?;  please
at sentence end; used to make an informal request
5.  so, ...;  well, ...;  you see, ...;  you understand?
at the end of a non-final clause; used to draw the listener's attention to something
6.  I'm not sure if ...;  I have my doubts about whether ...
at sentence end after the question marker か