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 could not ulcerate
you could not ulcerate
he could not ulcerate
we could not ulcerate
you could not ulcerate
they could not ulcerate 	I could not be ulcerating
you could not be ulcerating
he could not be ulcerating
we could not be ulcerating
you could not be ulcerating
they could not be ulcerating	I could not have ulcerated
you could not have ulcerated
he could not have ulcerated
we could not have ulcerated
you could not have ulcerated
they could not have ulcerated	I could not have been ulcerating
you could not have been ulcerating
he could not have been ulcerating
we could not have been ulcerating
you could not have been ulcerating
they could not 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 	
could I not ulcerate?
could you not ulcerate?
could he not ulcerate?
could we not ulcerate?
could you not ulcerate?
could they not ulcerate? 	could I not be ulcerating?
could you not be ulcerating?
could he not be ulcerating?
could we not be ulcerating?
could you not be ulcerating?
could they not be ulcerating? 	could I not have ulcerated?
could you not have ulcerated?
could he not have ulcerated?
could we not have ulcerated?
could you not have ulcerated?
could they not have ulcerated? 	could I not have been ulcerating?
could you not have been ulcerating?
could he not have been ulcerating?
could we not have been ulcerating?
could you not have been ulcerating?
could they not have been ulcerating?