Can I use "fall" instead of "drop" here?
That's a great question. "Drop" usually refers to something "dropping" from your hands. "Dropping" something suggests that someone was holding it at first, and now lets go of it. Ex: He dropped the ball. (He was holding the ball before) Ex: Do not take too many plates at once or you will drop them! "Fall" is generally for when it is not in someone's hands. Think of it as being from the view of the object itself. Ex:The book fell off the desk. Ex: Tie your shoelaces or you will fall down! So in this case you could not replace "drop" with "fall". Because, while the motion/end result for both "drop" and "fall" is the same, "fall" doesn't imply that someone was holding the phone before. It is much more passive than "drop".
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