**I. Complete the following sentences in your own ways:**

42. What would you (do) if the bus had been late?
43. What would you (do) if you had been there yesterday?
44. If you had had money yesterday, what would you (buy) first?
45. Please call the doctor if your son (has) a temperature.
46. If they'd known you were there, they would have (come) sooner.

**III. Complete the following sentences in your own ways:**

1. If I know your address, I will send you an invitation.
2. If I had a lot of money now, I would travel around the world.
3. If we don't study hard every day, we might fail our exams.
4. If your mother was ill, I would take her to the hospital.
5. If I met a shark, I would swim away as fast as I could.
6. If tomorrow it is fine, I will go for a hike.
7. If I had known the keys yesterday, I would have unlocked the door.
8. If Nam had not eaten too much chocolate, he would not have felt sick.
9. If I saw a snake, I would stay as still as possible.
10. If I want to go to university, I must work hard to get good grades.