1. Unless Jane and Simon make a reservation, they will not be able to find a table at the restaurant.
2. Unless I finish my homework before 8 pm, I shall not be able to watch my favourite TV show.
3. When Lily arrives at the airport, give me a call.
4. When Andy moves to his new house, he will redecorate every room.
5. If Susan leaves for work now, she will arrive on time.
6. Unless we find matches, we will not be able to light the barbecue. (Nie jestem pewna, czy to zdanie jest poprawne czy nie, bo jestem veganka, i nic nie wiem o barbecue.......=P)
I hope that I put the sentences together correctly for you. Anyway (sentences #1-5) are in perfect English, because I am Polka Amerykanka =) Ale moj polski jeszcze jest okropny =(