1. Who has (to write) this article? 2. We have already (to learn) a lot of English words.
3. Who has (to teach) you to do it?
4. He has just (to do) something for us.
5. Have you (to find) the book?
6. We have just (to talk) about it.
7. He has just (to say) something about it.
8. He has (to tell) us nothing about it.
9. She has (to tell) them some stories about dogs.
10. We have (to have) two lessons today.​

1. If I didn't have a headache, I would do my work faster.

2. If my parents had more free time, we would spend a lot of time together.

3. If I travelled abroad, I would start vlogging.

4. If I were you, I would stop wasting my time on social media.

5. Unless I study harder, I won't pass my exam.

6. My friend agrees to help me when he has time.

7. If we had played better, we would have won.

8. If my parents had enough money, they would buy a new car.

9. Unless we have a ticket, they won't let us get inside.

10. If I get up early, I won't be late for school.

The forest is not just a clump of trees and the complex ecosystem that combines plants, animals, mushrooms. But with the growing number of people, their active development of land for economic needs began the process of deforestation.
Despite the fact that forests are renewable resources, their rate of deforestation is too high and is not covered by the rate of reproduction. Annually destroyed millions of hectares of deciduous and coniferous forests. For example, rainforests that are home to more than 50 % of existing species on Earth, used to cover 14 % of the planet, and now only 6 %.
In order to reduce the damage from logging, you must:
economical use of paper products; buy recycled products. to green the area around their homes; to replace the cut trees with new trees; to draw public attention to the problem of deforestation.