E) Past Continuous Passive:
1. The wind was blowing the clouds away.
2. Arthur was introducing his friend to his guests.
3. She was watering the flowers when I saw her.
4. Someone was following John all the way from the station.
5. They were taking pictures of a flying object.
f) Present Perfect Passive:
1. They have already brought the books.
2. My cat has caught a mouse.
3. We have eaten all the apples on the dish.
4. Somebody has broken the window.
5. Most people have heard the story.
g) Past Perfect Passive:
1. The workers had finished the work by the end of the month.
2. The teacher had explained all the new rules by the end of the lesson.
3. The cashiers had counted the money by the closing time.
4. The librarian had sorted out all the books by the beginning of the school-year.
5. The tourists had seen all the sights by the departure day.
h) Future Perfect Passive:
1. The students will have finished the test by the end of the second lesson.
2. He will have received twenty visitors by the end of the working day.
3. You will have wasted so much time if you fail your exam.
4. I will have learned two foreign languages by the end of the University course.
5. The organizers will have exhibited the paintings in five cities by the end of the year.
2. Make the sentences negative and interrogative:
1. Houses are built very quickly now.
2. This work will be finished tomorrow.
3. He is being waited for in the room.
4. The delegation was met in the airport.
5. The article has been translated into Russian.
6. The doctor has been sent for.
7. The poem was written in 1827.
8. The test will be written tomorrow.
9. Mike is wanted on the phone.
10. The question was being discussed from 9 to 11.
Применение систем трехфазного тока обладает некоторыми преимуществами перед однофазной системой:
1. При одинаковых напряжениях и мощностях потребителей и прочих равных условиях питание трехфазным током позволяет получить значительную экономию материала проводов по сравнению с тремя однофазными линиями.
2. При прочих равных условиях трехфазный генератор дешевле, легче и экономичнее, чем три однофазных генератора такой же суммарной мощностью. То же самое относится к трехфазным двигателям и трансформаторам.
3. Трехфазная система токов позволяет получить вращающееся магнитное поле с трех неподвижных катушек.
4. При равномерной нагрузке трехфазный генератор создает на валу приводного двигателя постоянный момент, в отличии от однофазного генератора, у которого мощность и момент пульсируют с двойной частотой тока
Xalqimiz "Vatanni sevmoq — iymondandir", deb bekorga aytmagan. Vatanga sadoqat va muhabbat ham insonning iymonli ekanligini bildiradi. Inson ma’naviy olamining kuchi, qudrati uning Vatan oldidagi burchi, mas’uliyatini qanday anglab tushunishida ham namoyon bo‘ladi. Bizning tinchligimiz uchun xizmat qilayotgan, sarhadlarimizda tik turgan Vatan himoyachilariga tinch va osuda tunlar uchun rahmat aytaylik. Ulardagi vatanparvarlik tuyg'usi o'z jonlaridan ham azizroq.Vatan ozodligi, tinchligi va xavfsizligi himoyachilari esa mudom hurmat-e’tiborda. Chegarachilarimizga ham kattadan katta rahmat. Men ham ulg'ayib, tinchlik uchun xizmat qilaman.