could ulcerate
Regular verb: ulcerate - ulcerated- ulcerated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could ulcerate
you could ulcerate
he could ulcerate
we could ulcerate
you could ulcerate
they could ulcerate 	I could be ulcerating
you could be ulcerating
he could be ulcerating
we could be ulcerating
you could be ulcerating
they could be ulcerating	I could have ulcerated
you could have ulcerated
he could have ulcerated
we could have ulcerated
you could have ulcerated
they could have ulcerated	I could have been ulcerating
you could have been ulcerating
he could have been ulcerating
we could have been ulcerating
you could have been ulcerating
they could have been ulcerating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't ulcerate
you couldn't ulcerate
he couldn't ulcerate
we couldn't ulcerate
you couldn't ulcerate
they couldn't ulcerate 	I couldn't be ulcerating
you couldn't be ulcerating
he couldn't be ulcerating
we couldn't be ulcerating
you couldn't be ulcerating
they couldn't be ulcerating	I couldn't have ulcerated
you couldn't have ulcerated
he couldn't have ulcerated
we couldn't have ulcerated
you couldn't have ulcerated
they couldn't have ulcerated	I couldn't have been ulcerating
you couldn't have been ulcerating
he couldn't have been ulcerating
we couldn't have been ulcerating
you couldn't have been ulcerating
they couldn't have been ulcerating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I ulcerate?
could you ulcerate?
could he ulcerate?
could we ulcerate?
could you ulcerate?
could they ulcerate? 	could I be ulcerating?
could you be ulcerating?
could he be ulcerating?
could we be ulcerating?
could you be ulcerating?
could they be ulcerating? 	could I have ulcerated?
could you have ulcerated?
could he have ulcerated?
could we have ulcerated?
could you have ulcerated?
could they have ulcerated? 	could I have been ulcerating?
could you have been ulcerating?
could he have been ulcerating?
could we have been ulcerating?
could you have been ulcerating?
could they have been ulcerating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I ulcerate?
couldn't you ulcerate?
couldn't he ulcerate?
couldn't we ulcerate?
couldn't you ulcerate?
couldn't they ulcerate? 	couldn't I be ulcerating?
couldn't you be ulcerating?
couldn't he be ulcerating?
couldn't we be ulcerating?
couldn't you be ulcerating?
couldn't they be ulcerating? 	couldn't I have ulcerated?
couldn't you have ulcerated?
couldn't he have ulcerated?
couldn't we have ulcerated?
couldn't you have ulcerated?
couldn't they have ulcerated? 	couldn't I have been ulcerating?
couldn't you have been ulcerating?
couldn't he have been ulcerating?
couldn't we have been ulcerating?
couldn't you have been ulcerating?
couldn't they have been ulcerating?