If you said "use coincidence in a sentence" you already know how to use it in a sentence and are probably getting examples. if you said" how do you use coincidence in a sentence" you most-likely don't know the definition of it.
Here is an example: The cinders flying through the air look beautiful at night.
scientific
Sample Sentence: The magician put his audience into a trance.
I would have answered nonetheless.
I had to stay up and wait until every cinder in the fire pit burnt out.
"Charles take your hands out of your trousers, that is a very crude thing to do in public."The steps were crude, made from cinder blocks and boards.
Yes you would have to use glue like liquid nails!
The boards and cinder blocks are only a makeshift until the bookcase arrives.
I would use it correctly in a sentence, of course. Thank you for asking.
Jarry use paroxysm in a sentence.\
Would not that be "Would not that be?"?
reassuring sentence
How would you like me to put that in a sentence?
elan in a sentence
I can answer it for you.
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.