Поставить предложения в отрицательной и вопросительной форме:

Перепишите и переведите предложения на русский язык. Поставьте предложения в отрицательную и вопросительную формы.
1. The laboratory assistant always fixes the devices himself. 2. They work in an industrial enterprise. 3. They speak English fluently. 4. They often make a lot of experiments. 5. The students begin their studies in October. 6. We change the temperature of gas in our experiment. 7. They often stay at work after 6 o’clock. 8. I always discuss different problems with my colleagues. 9. I spend my holiday in the seaside. 10. The students of our Institute often go to the industrial exhibitions. 11. The engineers examine devices. 12. You attend all the lectures. 13. He always attends practical classes. 14. She wants to work in an oil company. 15. It often rains in this part of Russia. 16. He likes to read scientific articles. 17. He often takes part in scientific conferences. 18. The students of our University do researches in the field of mathematics. 19. The Professor of our University delivers interesting lectures to the students. 20. They like to publish articles in foreign scientific journals.