We all use the word
dialogue quite often. If you can remember, the prefix
dia means between ( we've seen it in the
word 'diagnosis'). If you see the fragment logue in
any word, remember it is something related with
speak.
Now, the real
business...,
1) prologue (
pro=pre, before): An introduction to a play or
book.
2)
epilogue ( epi=upon, after): A short conclusion
at the end of a play or book.