такое:
выделите приставки и суффиксы:
1. science, scientist, scientific
2. to consume, consumer, consumption
3. to increase, increasing, increasingly
4. to provide, provision, provider
5. to change, exchange, changeable
6. different, difference, to differ, differential, differently, differentia, differentiate
7. to organize, organizer, organization, organizing, organizational
8. to depend, dependence, dependency, dependent, dependable, independent, independence, independently, interdependence
9. to finance, finances, financial, financing
10. to govern, governor, government, governing, governmental
!

1. If you are busy, I will leave you. If you were busy, I would leave you. If you had been busy, I would have left you.

2. If my friend comes to see me,  I will  be very glad. If my friend came to see me, I would be glad. If my friend had come to see me , I would have been glad.

3. If mother buys a cake, we will have a very nice tea party. If mother bought a cake , we would hhave a very nice tea party. If mother had boughta cake , wewouid have had a verry nice tea party.

4. If we recieve a telegra from  him, we won't  worry. If  we recieved a telegram, we  wouldn't worry. If we had recieved a telegram from  him, we wouldn't have worried  

Объяснение:

1. Various kinds of sports are popular in Russia. 2. Both children and grown-ups are fond of sports. 3. What is the matter with her? She is so excited. -- I do not know. 4. Where are you going? - - I am going to the Dynamo stadium to see the match which takes place there today. 5. Did you know that ^ very interesting match takes place last Sunday? 6. He went to the south a week ago, 7. When I was about fifteen years old, I  enjoied playing football. 8. Our football team won many games last year. 9. Where is Boris? - He is playing chess with his friend. 10. I am sorry I missed the match yesterday. But I know the score. It is 4 to 2 in favour of the Spartak team. 11. Nellie will leave for Moscow tomorrow, 12.1 am in a hurry. My friends is waiting for me. 13. You was at the theatre yesterday. Do you like the opera? — Oh yes, I enjoy it greatly. 14. Are you going to London next summer?