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Singular or plural ?

Singular or plural ?



                         
                         
  W+B7523e use some nouns only in the plural. For example :  
                         
  slacks / pants , jeans, shorts, pajamas, scissors    
  glasses                    
                         
  You can use a pair of ... with this words :      
                         
  I need some new slacks.            
  I need a new pair of slacks.            
                         
                         
  We do not often use the plural of person { persons },  
  instead we use people :              
                         
  He is a nice person.              
  They are nice people. { not nice persons }      
                         
                         
  These nouns end in - s but they are not usually plural :  
                         
  mathematics, physics, economics, athletics, news,  
  gymnastics, electronics,windows,statistics,    
                         
  Gymnastics is my favorite sport.          
  What time is the news on television?        
                         
  These words end in - s can be singular or plural:  
                         
                 means , series, species          
                         
  a means of transportation               
  Many means of transportation          
                         
  a television series                
  two television series              
                         
  a species of bird                
  200 species of bird              
                         
                         
  We always use a plural verb with the police :    
                         
    The police have arrested Tom.        
    Are the police paid well?          
                         
  Sometimes we use a plural noun with  a singular verb.  
  We do this when we talk about  a sum of money  
  a period of time, a distance, etc :          
                         
  Five thousand dollars { it }  was stolen in the robbery.
  Three years  { it } is a long time to be without a job.  
                         
  We say " a vacation of three weeks"  =  "a three - week   
  vacation":                  
                         
  I have a three - week vacation in July.        
  Three - week is used as an adjective before vacation.  
                         
  a ten- dollar bill { not dollars }          
  a four - week English course            
  a six - hour journey              
                         
                         
                         

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