Make these sentences negative and interrogative. Our University is called the University of Means of Communications.
2. Locomotive is one ofthe constantly developing means of transport.
3. When speaking about pantograph we must know what the word «shoe» means.
4. It is easy to boost the AC voltage which means that more power can be sent over the
transmission lines with DC.
5. There are different means of protecting catenary from corrosion.
6. By means of increasing the number of trains on the same line it is possible to carry more
passengers and freight.

Past Simple и Present Perfect 
1. I saw you yesterday. 
2. I have read this book. 
3. I understood the text. 
4. I met him yesterday. 
5. He has already found the book. 
6-7. He said, he knew her adress. 
8. I told her this story. 
9. Our team didn`t win the championship last year. 
10. I have already done the exercise. 
11. He wrote a book last year. 
12. He taught me a good lesson. 
13. Sorry, I forgot your address. 
14-15. I took my umbrella and went out. 
15. I left my umbrella at home. 
16. Made in China)) 
17. I have cut my hair off. 
18. I won the prize last time. 
19. I lost my bag yesterday. 
20. He has paid the price. 
21. He came late last evening. 
22. She gave me a good advice. 
23. I`ve already heard the story. 
24. You could learn it by heart, but you didn`t. Shame on you! 
25. I thought he was my friend. 
26-27. Everyone became quiet and sat down in their seats as the show started. 
28. The lesson has already begun. 
29. He drove his car too fast last time. 
30. I spoke to me friend yesterday.

1. Is there a book on the table? Where is the book? What is there ion the table? There is a book on the table, isn't there?
2 Must he work hard today? He must work hard today, mustn't he? Who must work hard today? When must he work hard? What must he do?
 3. are we leaving for Moscow next week? We are leaving for Moscow next week, aren't we? Who is leaving for Moscow next week? Where are we leaving for? When are we leaving for Moscow?
4. Were we  reading the whole evening? We were reading the whole evening, weren't we? What were we doing the whole evening? When were we reading.
5. Don't they  go to work on Sunday? They don't go to work on Sunday, do they? What don't they do on Sunday? Where don't they go on Sunday? When don't they go to work?
6.  Is it not cold today?  It is not cold today, is it? When is it not cold?