1. напишите следующие предложения в а) past indefinite; б) future indefinite согласно образцу. образец: he must pass the examination in anatomy. he had to pass the examination in anatomy. he will have to pass the examination in anatomy. 1. the students may take all necessary textbooks from the institute library. 2. he can help you with your translation. 3. you must repeat the material of the lectures before the examination. 4. they cannot translate these articles without a dictionary.

1. The students might take all necessary textbooks from the Institute library. 2. He could help you with your translation. 3. You had to repeat the material of the lectures before the examination. 4. They could not translate these articles without a dictionary.
1. The students will probably take all necessary textbooks from the Institute library. 2. He will be able to help you with your translation. 3. You will have to repeat the material of the lectures before the examination. 4. They will not be able to translate these articles without a dictionary.

Have been tested - Новые три вагона поезда-цистерны были испытаны в суровых зимних условия на ж/д в Аляске.
will have been completed - Строительство моста и дамбы будет закончено к началу сезона навигации.
are being constructed - В настоящее время в Европе и Азии строятся 2500 км скоростных линий.
maintains - система кондиционирования воздуха всегда поддерживает оптимальную температуру и влажность в вагоне.
is being built - В настоящее время новая высокоскоростная железнодорожная линия строится на севере России. 
has caused - Потоп значительно повредил железнодорожную ветку.

1. It's not always easy for the old and the young to find a common language.
2. Don't envy the rich: money doesn't always bring happiness.
3. Governments have to develop social programs to help poor people.
4. I quite like old houses: they have an atmosphere of their own.
5. You don't look beautiful today!
6. Looking after the sick is a real art.
7. The beautiful are often admired.
8. Deaf people often use their hands to communicate in sign language.
9. Some of her relatives were among the dead and injured.
10. Have you ever been unemployed?
11. All parents want to see their children among the happy.