Should teenagers have mobile phones 70 ​

if Mike had traveled with us around England last summer we would know more about customs and traditions of this country nowif ann hadn't vanished so unexpectedly yesterday I would have explained everything to herif John hadn't been ill then he would have joined usyou would be fine now if you had put on warm clothes yesterdaymy brother would be a good surgeon now if he had worked harder at the UniversityMary would have written her essay without mistakes if she had spent more time on studyingif Alice had made notes during the lectures in winter she would be able to use those materials for her exam tomorrowif I had finished my book last month I would start a new one next week

1. I read books in the evening. 2. I don't read books in the morning. 3. I am writing an exer¬cise now. 4. I am not writing a letter now. 5. They are playing in the yard now. 6. They aren't playing in the street now. 7. Are they playing in the room now? 8. He helps his mother every day. 9. Does he help his mother every day? 10. He doesn't help his mother every day. 11. Do you go to school on Sunday? 12. My friend doesn't like to play foot¬ball. 13.1 am not reading now. 14. Is he sleeping now? 15.We don't go to the country in winter. 16.My sister eats sweets every day. 17. She is not eating sweets now. 18. They do their home-work in the afternoon. 19. They don't go for a walk in the evening. 20. My father doesn't work on Sunday. 21. He works every day.