Imagine that one day your wildest dreams come true; imagine that someone wants to turn your book into a movie. Now, imagine that your favorite actor is going to speak the dialogue that you have written. That actor wants good lines, dramatic lines, and memorable lines.
Please, do not write dialogue like this:
“I love you,” he said.
“You do?” she asked.
“A bushel and a beck.”
BORING. YAWN. STOP NOW.
Hint: If you get bored typing your dialogue, then your reader is certainly going to get bored reading it.