15. This book (have to return) to the library tonight. 16. The other books (return) yesterday. 17. That book (should

15. This book has to be returned to the library tonight. 16. The other books were returned yesterday. 17. That book should be returned tomorrow. 18. These letters are going to be mailed tomorrow. 19. That letter ought to be sent immediately. 20. This letter must be sent today. 21. Those letters arrived yesterday. 22. I don’t have my car today. It’s in the garage. It is being repaired right now. 23. Kate didn’t have her car last week because it was in the garage. While it was being repaired, she took the bus to work. 24. The mechanic repaired Tina’s car last week. 25. Glass is made from sand. 26. You shouldn\'t carry large sums of money with you.