C) the Perfect Tenses Example: They have already brought the medi¬cine. — The medicine has already been brought.

8. He has booked the tickets and the clerk will have brought them by 2 o'clock. 9. They had painted the house by his arrival. 10. The police haven't found the reason for the accident yet. 11. Have you touched anything here? 12. The sociologist has interviewed a lot of students.13. Have they tested all the machines? 14. The flood has caused considerable damage. 15. John will have received the papers by tomorrow.

d) modal verbs.
Example: He can do this work. — The work can be done (by him).
1. She can find a job easily. 2. The matter is urgent. They should phone her immediately. 3. The boss wants Mr. Black. You must find him. 4. I can make an interesting offer to you. 5. He's got a pay rise and now they can buy a new house. 6. You must send the document as quickly as possible. 7. The weather is warm. She may plant the flowers. 8. The document is of great importance. He must show it to us. 9. He must give back the book on Sunday. 10. Their kitchen is large and they can use it as a dining room. 11. Ecologists say that we should take care of our planet", 12. You must send for the doctor immediately. 13. The lecture is over. You may ask questions. 14. You should avoid the center of town during rush hours. 15. They agreed that the club should raise membership fee.