1. When autumn (come) ______comes_________ , the leaves (fall) _______will fall________ from the trees.
2. He works flexible hours; if there is not much to do, he (come) _________will come_____ home early.
3. If you ______finish_________ (finish) your homework, you can go out.
4. If David _________gets______ (get) a good grade from his English presentation, I will take him to the movie theater.
5. If there ________is_______ (be) traffic, we will use the subway.
6. I will go to New York next week if I _______find________ (find) a cheap ticket.
7. If you don't accept the offer, you _____will regret__________ (regret) it later.
8. If Helen apologizes to me, I _____will forgive__________ (forgive) her.
9. If Deren __________buys_____ (buy) a car, he will drive us to school.
10. We want to see the White House if we _____visit__________ (visit) Washington.
11. If you don't study regularly, you ________will fail_______(fail) in your exams.
12. If David _______arrives________ (arrive) on time, I will be very surprised.
13. If we don't protect the tigers, they ________will extinct_______ (extinct) soon.
14. You can see better if you _____turn on __________ (turn on) the light .
15. If you don't take a cab now, I am afraid we _______will be________ (be) late for the meeting