Student's Book p.132
| 
     a.       
      1. isn´t    
2. Did     
3. didn´t 
4. Would              
5. does                 
6. Has    
7. won´t 
8. Can´t | 
b.    
       1.am             2. Isn´t   
       3. Is              4. Don´t                 
       5. Have
          6. Haven´t           
       7. have          8. don´t 
       9.
  do             10. don´t 
      11.
  do            12. would                             | 
 
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