It made me sick to even look at him!
I am sickened by you, you fat git
I caught the flu after being exposed to someone who was sick.
I knew that I would also disclose my location to the enemy if I were to call out to my team. I would like the first person with the answer to call out.
Using the word "then" at the beginning of a sentence is not incorrect. However, it does not make a sentence complete. A complete sentence must have, at a minimum, a subject and a verb. "Then" is neither of those.
The hunter stalked silently through the forest, eyes trained on its prey.
I am sickened by you, you fat git
I was sick yesterday, but I have recovered.
I was sick, but my brother was sicker, and our sister was the sickest of us all.
The sick man asked the doctor to make a house call.
I am getting sick of answering your questions!
He has no compassion for the poor or the sick.
the nurse identified he was sick
I caught the flu after being exposed to someone who was sick.
i was absent yesterday because I was sick that day
I needed a representative to do my presentaion because I was sick.
Don't guzzle that water; you'll get sick!
Yes I certainly can make a sentence with that word.