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| Compiled from Grammar Builder Book 3 | 
The rules:
- In a statement, can, could, may or might is used in this way:
   Subject   +   can/could/may/might   +  
base form of main                                                                    verb/ the verb ‘to be’
- You              may                                       sit
     with us.
- Jason           
     might                           be the new manager.
- In a question, can, could, may or
     might is used at the beginning of the sentence.
Can/Could/May/Might
  +  
subject   +   base form of main                                                             verb/the verb ‘to be’
·        
Can                             ducks                     fly?
·        
Could                               you                be nicer to
your sister?
- Could and might are used to express the possibility
     of an       action or event in the
     past: 
Subject  
+   could/might   +   have  
+   past participle form of                                                                               main
verb/ the verb ‘to                                                                  be’
·        
John                  could
           have         seen
this movie.
·        
Peter                 might           have          fed the dog.                                                                                                            
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| Compiled from Grammar Builder Book 3 | 

 
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