1.Unless you are more confident in English, you won't succeed to speak.
2.She doesn't want to come to Jim's party unless he sends her an invitation.
3. Your friends will go on their honeymoon to Spain unless they don't find a cheaper trip.
4. Unless we protect our environment from pollution, the climate on Earth will change dramatically.
5. He won't listen to her any longer unless she stops talking for a moment.
