The Last Book on Screenwriting You'll Ever Need," a book on screenwriting by Blake Snyder, which provides readers with line-by-line tactics for writing a script.

A common way to transition into a flashback is to invoke the character's memory—having them see something that resonates, ...

This means writing in a casual, conversational tone – like you're telling a story to a friend, or even your pet iguana. Your goal is to tell your story in a voice that's true to how you talk.