Please show the entire calculation, so that we know you didn't just copy it.
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.
"Can you use cruel in a sentence?" is a sentence, so yes, unless you mean something else?
'Bisters' is not a word, so I can't use it in a proper sentence.
Sentence: The cost of living in 2008 for France was so and so...
I think you just used 'highland' in a sentence.. So did I.
You are so impressionable.
The unsipid stew was a delightful surprise at the restaurant.
You are so fickle!
She was untrusting of strangers due to a past betrayal.
Yes, you can use so in a sentence. Here are just a few examples: So after a lot of controversy, they finally took her with them. They won the game, so they got the trophy.
you will use it in a sentence like this, ex: I'm so filled with fury right now.
Some people believe in aliens. Alien is a noun so use it in a sentence as a person