Unless you learn how to use a dictionary you won't make much progress.

I won't answer your question, unless you pay for me.

Unless you stop drinking, you could become larger. :)

*un‧less is used to say that something will happen or be true if something else does not happen or is not true: Unless some extra money is found, the theatre will close. I think you should complain - unless, of course, you are happy with the way things are. He won't go to sleep unless you tell him a story. I can't leave her unless I know she's all right. *not unless only if: 'Will you go with her?' 'Not unless she wants me to.'

I will not buy a new car unless it is easy to drive. I don't think he will climb that mountain unless he is stronger than I think He will not let me work for him unless I agree to teach him English.