could pollute
Regular verb: pollute - polluted- polluted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could pollute
you could pollute
she could pollute
we could pollute
you could pollute
they could pollute 	I could be polluting
you could be polluting
she could be polluting
we could be polluting
you could be polluting
they could be polluting	I could have polluted
you could have polluted
she could have polluted
we could have polluted
you could have polluted
they could have polluted	I could have been polluting
you could have been polluting
she could have been polluting
we could have been polluting
you could have been polluting
they could have been polluting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't pollute
you couldn't pollute
she couldn't pollute
we couldn't pollute
you couldn't pollute
they couldn't pollute 	I couldn't be polluting
you couldn't be polluting
she couldn't be polluting
we couldn't be polluting
you couldn't be polluting
they couldn't be polluting	I couldn't have polluted
you couldn't have polluted
she couldn't have polluted
we couldn't have polluted
you couldn't have polluted
they couldn't have polluted	I couldn't have been polluting
you couldn't have been polluting
she couldn't have been polluting
we couldn't have been polluting
you couldn't have been polluting
they couldn't have been polluting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I pollute?
could you pollute?
could she pollute?
could we pollute?
could you pollute?
could they pollute? 	could I be polluting?
could you be polluting?
could she be polluting?
could we be polluting?
could you be polluting?
could they be polluting? 	could I have polluted?
could you have polluted?
could she have polluted?
could we have polluted?
could you have polluted?
could they have polluted? 	could I have been polluting?
could you have been polluting?
could she have been polluting?
could we have been polluting?
could you have been polluting?
could they have been polluting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pollute?
couldn't you pollute?
couldn't she pollute?
couldn't we pollute?
couldn't you pollute?
couldn't they pollute? 	couldn't I be polluting?
couldn't you be polluting?
couldn't she be polluting?
couldn't we be polluting?
couldn't you be polluting?
couldn't they be polluting? 	couldn't I have polluted?
couldn't you have polluted?
couldn't she have polluted?
couldn't we have polluted?
couldn't you have polluted?
couldn't they have polluted? 	couldn't I have been polluting?
couldn't you have been polluting?
couldn't she have been polluting?
couldn't we have been polluting?
couldn't you have been polluting?
couldn't they have been polluting?