Ответ:

1. If I see Jane at the party, I will say hello and catch up with her.

2. If you don't know the way, you can ask for directions or use a map to find your destination.

3. I'll go to bed early if I have an early morning appointment or if I feel tired.

4. We'll miss you if you can't make it to the party or event.

5. If the weather is warm tomorrow, we can go for a picnic or enjoy outdoor activities.

6. If Jennifer comes home late, I will wait up for her or ask her to inform me beforehand.

7. If I have enough time, I will read a book or watch a movie.

8. If I have enough money, I will buy the things I need or save it for future expenses.

9. I'll turn off the lights if I'm leaving the room or not using them to save energy.

10. We will sell our car if we no longer need it or if we want to upgrade to a better one.

11. We can go to the beach if the weather is sunny and warm or if we have free time.

12. If he posts the letters now, they will reach the destination on time.

13. You'll learn a lot if you pay attention and actively participate in class or while studying.

14. If it rains tomorrow, I will stay indoors or carry an umbrella while going out.

15. What will you do if you miss your flight or if your flight gets delayed?