In one sentence:
They appear to have been involved in a car accident
In a sentence each:
One of the staff had an accident at work today and has gone to the hospital.
The lights appear in the sky when low cloud surrounds the mountain.
To create a sentence using both "accident" and "appear," you might say, "It was just an accident that made the situation appear more complicated than it really was." This sentence highlights the unexpected nature of the accident while also addressing its impact on perceptions.
He was in a state of coma after the accident. This is an example of WAS IN in a sentence.
The car accident was caused by the drunk driver.
The witness had to intercede for the woman in the accident.
The troop disbanded after the accident.
He had unimpaired vision until after the accident.
I saw an accident on the side of the freeway - two cars crashed and exploded.
Sure. The bunny just seemed to appear.
The man got transfigured after his accident.
Tom was hospitalized after the car accident.
The secret agent triggered the alarm on accident.
Oh no, he had a spoonerism! Translates to -- Oh no, he had an accident!