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—Why is the classroom so dirty? —Sorry,sir. It yesterday We forgot to do it.

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doesn't clean  didn't clean  isn't cleaned  wasn't cleaned  
cleaned   have worked   was cleaning   have been cleaning  
cleaned    being cleaned    to clean    Cleaning  
dry    open    clean    quiet  
cleaned    have worked    was cleaning    have been cleaning  
was working   have worked   worked   have been working  
was working  have worked  worked  have been working  
clean    to clean    being cleaned    cleaning  
clean it up  to clean it up  c  
was working    have worked    worked    have been working  
dry    open    clean    quiet
  
was working    have worked    worked    have been working  
clean    to clean    cleaning    cleans  
don't clean    didn't clean    weren’t cleaned    wasn't cleaned  
doesn’t clean    didn’t clean    isn’t cleaned    wasn’t cleaned  
shall    Will    Would    Do  
clean    to clean    being cleaned    cleaning  
dry    open    clean    quiet  

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