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Exercise 8. (Deduction, perfect modals) Finish each of the following sentences in such a way that it means the same as the sentence printed before it.

1. 
   I wasn't in the office yesterday, so you must have spoken to my assistant.
   

2. 
   I'm sure it wasn't Mrs. Elton you saw because she's in Bristol.
   

3. 
   I am certain he finished all his exercises and went shopping.
   

4. 
   It is impossible that Andy is having a bath.
   

5. 
   I am sure they are hungry now.
   

6. 
   It is impossible that John is at school right now.
   

7. 
   Nam was not at home either. Perhaps he went out with his girlfriend.
   

8. 
   I am sure that Tina didn’t steal the money.
   

9. 
   Certainly Kate wrote the article.
   

10. 
    I am sure Helen is playing the guitar now.
    

11. 
    In the event, the extra insurance we took out wasn't necessary.
    

12. 
    It was careless of you to leave the window open last night.
    

13. 
    It was a mistake of mine to park my car outside the police station.
    

14. 
    I gave Ted the message, but he already knew about it.
    

15. 
    Tom wished he had studied harder for his graduation exams.
    

Tom should .

16. 
    It was wrong of you not to call the fire brigade at once.
    

17. 
    Francis didn’t try as hard as he should have to find his brother.
    

18. 
    It was essential that Mike listen to your advice, but he didn’t.
    

19. 
    James was not told the news a long time ago although it was necessary for him. James should .
    
20. 
    The father gave the daughter too much money, but she did not spend much.