could denigrate
Regular verb: denigrate - denigrated- denigrated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could denigrate
you could denigrate
she could denigrate
we could denigrate
you could denigrate
they could denigrate 	I could be denigrating
you could be denigrating
she could be denigrating
we could be denigrating
you could be denigrating
they could be denigrating	I could have denigrated
you could have denigrated
she could have denigrated
we could have denigrated
you could have denigrated
they could have denigrated	I could have been denigrating
you could have been denigrating
she could have been denigrating
we could have been denigrating
you could have been denigrating
they could have been denigrating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't denigrate
you couldn't denigrate
she couldn't denigrate
we couldn't denigrate
you couldn't denigrate
they couldn't denigrate 	I couldn't be denigrating
you couldn't be denigrating
she couldn't be denigrating
we couldn't be denigrating
you couldn't be denigrating
they couldn't be denigrating	I couldn't have denigrated
you couldn't have denigrated
she couldn't have denigrated
we couldn't have denigrated
you couldn't have denigrated
they couldn't have denigrated	I couldn't have been denigrating
you couldn't have been denigrating
she couldn't have been denigrating
we couldn't have been denigrating
you couldn't have been denigrating
they couldn't have been denigrating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I denigrate?
could you denigrate?
could she denigrate?
could we denigrate?
could you denigrate?
could they denigrate? 	could I be denigrating?
could you be denigrating?
could she be denigrating?
could we be denigrating?
could you be denigrating?
could they be denigrating? 	could I have denigrated?
could you have denigrated?
could she have denigrated?
could we have denigrated?
could you have denigrated?
could they have denigrated? 	could I have been denigrating?
could you have been denigrating?
could she have been denigrating?
could we have been denigrating?
could you have been denigrating?
could they have been denigrating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I denigrate?
couldn't you denigrate?
couldn't she denigrate?
couldn't we denigrate?
couldn't you denigrate?
couldn't they denigrate? 	couldn't I be denigrating?
couldn't you be denigrating?
couldn't she be denigrating?
couldn't we be denigrating?
couldn't you be denigrating?
couldn't they be denigrating? 	couldn't I have denigrated?
couldn't you have denigrated?
couldn't she have denigrated?
couldn't we have denigrated?
couldn't you have denigrated?
couldn't they have denigrated? 	couldn't I have been denigrating?
couldn't you have been denigrating?
couldn't she have been denigrating?
couldn't we have been denigrating?
couldn't you have been denigrating?
couldn't they have been denigrating?