Yes, because it states a complete thought or fact. Any additional words would merely add additional information to the main idea.
No, "Is your jaw dropped open" is a question. It is asking about the position of your jaw.
A sentence for dropped I accidentally dropped the phone while I was talking on the phone.
The correct sentence is: "Three young pretty ladies dropped by the office."
The adverb in this sentence is "wearily" because it describes how Sally dropped onto the couch.
The prepositional phrase in the sentence is "under the desk."
I accidentally dropped my phone, causing it to shut off.
my jaw dropped open when i say the fireworks explode in the sinky twilight
Yes, the sentence is mostly clear in its meaning. However, to improve clarity, you could consider rephrasing it slightly to "Her jaw dropped as if she had seen the devil."
a thing that open your jaw
"I just saw your jaw drop!"
He dropped the ball.
The operative word was dropped in the sentence, fragmenting it severely. I just dropped in to say hello. Dick dropped Jane's ball.
no because your jaw is broken.
You could get lock jaw which is where your jaw clicks into an open position and won't close again. To stop this would be to not open your mouth really wide and fast.
My Jaw Dropped
A sentence for dropped I accidentally dropped the phone while I was talking on the phone.
It's broken
You have a tetanus because you have a locked jaw.