Except on a specified condition; if not
"Can you use cruel in a sentence?" is a sentence, so yes, unless you mean something else?
One sneeze does not mean that you have swine flu, unless you are a hypochondriac.
no you should not unless it is at the begging of the sentence!
No, except at the beginning of a sentence because it is not a proper noun.
not unless it is the first word of the sentence
Death!Unless your talking about a prison sentence.
You will get no pudding unless you eat your salad.
Depending on the sentence, not unless could be the correct form.
No, unless it's at the beginning of a sentence.
No, unless it is at the start of a sentence.
Unless anyone writes a better answer this is all your going to get.
Unless it is at the beginning of a sentence, then it is not capitalised.