How do you make Reverbs like movie trailers

Hello everyone,

This is a question for trailer editors or sfx composers, I want to learn how to make reverbs like in trailers when some one screams or a girl moans they add a nice echo type of sfx. How would I create something like that? I am really trying to improve as an editor but I feel limited because I know what I want but I can't create it because I can't figure out the first step. Can anyone steer me the right direction how to create this type of sound effect? I have Final cut pro 7 with soundtrack pro.