1. Maria (got) some bad news last week. She (has been) sad since she (got) the bad news.
2. I (started) school when I was five years old. I (have been) at school since I (was) five years old.
3. I (have changed) my job three times this year.
4. I (changed) my job three times last year.
5. The weather was hot and dry for many weeks. But two days ago it (rained).
6. Tom (broke) his leg five days ago. He’s in hospital. He (has been) in hospital since he (broke) his leg.
7. Are you going to finish your work before you go to bed? — I (have finished) it (already). I (finished) my work two hours ago.
2. I wouldn't say that to her, if I weren't sure she would understand me properly.
3. If you don't wake up on time, you will be late for school.
4. We'll stay at home unless it stops raining.
5. If you didn't go to the gym so often, you wouldn't be strong and healthy.
6. Unless you invite her to the party, she won't come to your place.
7. She wouldn't have forgotten the appointment, if she had put it down in her notebook.
8. We would have reached the airport on time, if we hadn't got stuck in a traffic jam.
9. If you drive so carelessly, you will get into trouble.
10. If I had got to the station earlier, I would have caught the train.