"The difference between the right word and the almost right word is the difference between lightning and the lightning bug."
Because film is visual, it is much better to SHOW than to TELL. Never use dialogue in place of action. After all, the first movies were silent with no dialogue. And look how successful they were. So when do you use dialogue? You use dialogue when you can't show what you want through action. Your dialogue needs to accomplish one of three things:
1. Give information
2. Move your story forward
If your dialogue doesn't fit into any of these categories, don't use it! Never write dialogue just for the sake of having small talk or exchanging pleasantries, like "Hi," "How are you?" "I'm fine." These pleasantries will slow down your screenplay and are boring. There is no purpose for small talk, and all dialogue must have a purpose.
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