Поставьте сказуемое главного предложения в past indefinite и произведите соответствующие изменения в придаточных предложениях. 1. he says he will drive a car himself. 2. she thinks that they will speak about great achievements in nuclear physics. 3. he asks whether you can read english. 4. they ask if he is expecting any visitors. 5. we consider that great changes have been made in modern industry. 6. the teacher considers that the level of his students' knowledge is high enough. 7. we know that safety is one of the main concerns of transportation. 8. we believe that they will be given every opportunity to go on with their experiments. 9. the mother asks the teacher if her child studied properly. 10. nobody knows how this accident occurred. 11. we believe that she will win the first prize at the figure-skating competition. 12. he says his brother is taking his exam now. 13. he asks if the plan is changed. 14. the teacher cannot understand how the boys have solved that complicated problem in such a short time.

1. He said he would drive a car himself.
2. She thought that they would speak about great achievements in nuclear physics.
3. He asked whether you could read English.
4. They asked if he was expecting any visitors.
5. We considered that great changes had been made in modern industry.
6. The teacher considered that the level of his students' knowledge was high enough.
7. We knew that safety was (is) one of the main concerns of transportation.
8. We believed that they would be given every opportunity to go on with their experiments.
9. The mother asked the teacher if her child had studied (studied) properly. 10. Nobody knew how that accident had occurred.
11. We believed that she would win the first prize at the figure-skating competition.
12. He said his brother was taking his exam then.
13. He asked if the plan was changed.
14. The teacher couldn't understand how the boys had solved that complicated problem in such a short time.