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This river is polluted and the s    of the water is covered with oil.

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have polluted    is being polluted    has been polluted    have been polluted  
have polluted   is being polluted   has been polluted   have been polluted  
taken; polluting    taking; being polluted    taken; being polluted    taking; to be polluted  
have polluted    is being polluted    has been polluted    have been polluted  
was polluted    was polluting    had been polluted    has been polluted  
polluting  pollute   polluted  to pollute  
polluting    from polluting    being polluted    polluted  
polluting    from polluting    being polluted    polluted  
have polluted  is being polluted   has been polluted  have been polluted  
is not polluted   would not be polluted   had not been polluted   would not have been polluted  
stop… from polluted    keep…being polluted    prevent… being polluted    stop…from polluting  
to keep; polluted    to prevent; being polluted    keep; polluted    prevent; being polluted  
is not polluted   would not be polluted   had not been polluted   would not have been polluted  
is not polluted    would not be polluted    had not been polluted    would not have been polluted  
have; polluting    has; polluted    has; from being polluted    have; being polluted  
had polluted  has been polluted   has polluted  had been polluted  
to prevent; being polluted    preventing; polluting    preventing; being polluted    to prevent; polluting  
have been polluted    is being polluted
  
has been polluted    have polluted  
has been used; being polluted   is used; polluted   are used; being polluted   got used; polluting  
have polluted    is being polluted    has been polluted    have been polluted  

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