1. The solar lamps are lighting the tunnel. The solar lamps were lighting the tunnel. The solar lamps will be lighting the tunnel. 2. The scientist is developing a new source of energy. The scientist was developing a new source of energy. The scientist will be developing a new source of energy. 3. The engineers are working at the problem of using solar power. The engineers were working at the problem of using solar power. The engineers will be working at the problem of using solar power. 4. The people are not using poor methods of research. The people were not using poor methods of research. The people will not be using poor methods of research. 5. The students are not having an interesting discussion. The students were not having an interesting discussion. The students will not be having an interesting discussion. 6. The sun is not shining brightly. The sun was not shining brightly. The sun will not be shining brightly. 7. The workers are complaining about unsafe working conditions. The workers were complaining about unsafe working conditions. The workers will be complaining about unsafe working conditions. 8. The government is trying to protect consumers. The government was trying to protect consumers. The government will be trying to protect consumers.
1. He will shut up, if he does not forget. 2. He always attend classes if he feels well. 3. We always went to the city if there was no rain. 4. He browses the newspaper at breakfast, if not late. 5. She cursed him if she was delayed. 6. We can do the exercise if you wish. 7. If he wanted to relax, he went to the park. 8. She will tell if something happens. 9. He will be late for a train, if he does not hurry. 10. She never denied anything if she was not sure. 11. She will borrow the magazine if he returns it. 12. He is always nervous if he is not congratulated. 13. She paints if there is a desire. 14. What will he do if he is fired? 15. When she takes an umbrella, rain never happens. 16. He will not freeze if he wears a jacket. 17. When she does not know the word, she searches for it in the dictionary. 18. If he was ashamed of strangers, he began to stutter. 19. If he arrives tomorrow, he will tell everything. 20. If he was concerned, she felt lonely, she would come the next time. 21. If he called him. 22. She is not ashamed to ask when he does not understand something. 23. She would be grateful if he could help. 24. He will be happy if she writes. 25. If he does not, he will be glad if he is at home, he will leave a note.
2. The scientist is developing a new source of energy. The scientist was developing a new source of energy. The scientist will be developing a new source of energy.
3. The engineers are working at the problem of using solar power. The engineers were working at the problem of using solar power. The engineers will be working at the problem of using solar power.
4. The people are not using poor methods of research. The people were not using poor methods of research. The people will not be using poor methods of research.
5. The students are not having an interesting discussion. The students were not having an interesting discussion. The students will not be having an interesting discussion.
6. The sun is not shining brightly. The sun was not shining brightly. The sun will not be shining brightly.
7. The workers are complaining about unsafe working conditions. The workers were complaining about unsafe working conditions. The workers will be complaining about unsafe working conditions.
8. The government is trying to protect consumers. The government was trying to protect consumers. The government will be trying to protect consumers.