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1) First, instead of narrating actions or emotions, let the other characters do it. Let them describe, let them notice emotions.
"Are you leaving, Jayne?"2) Do, don't tell. If you have chances in the book, use interactive narrative devices instead of talking to the reader.
"Ah, Patricia, you scared me."
"That’s ridiculous. How could my coming out of Peter’s room scare you?"
"I never heard you come into the kitchen. Never mind."
"Are you going out, Jayne? You’ve changed your clothes."
"Yeah, thinking about it. Your hair’s wet. Did you you and Peter shower... together?"
Here is an example: Rather than a character counting to three, the narrator does...thus, the reader counts along with the character.
One-thousand-one, one-thousand-two, one-thousand-three.Source: Brainstormer
He plugged his ears. Any second now. She should see the snake.
She should be screaming by now.