could rupture
Regular verb: rupture - ruptured- ruptured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rupture
you could rupture
he could rupture
we could rupture
you could rupture
they could rupture 	I could be rupturing
you could be rupturing
he could be rupturing
we could be rupturing
you could be rupturing
they could be rupturing	I could have ruptured
you could have ruptured
he could have ruptured
we could have ruptured
you could have ruptured
they could have ruptured	I could have been rupturing
you could have been rupturing
he could have been rupturing
we could have been rupturing
you could have been rupturing
they could have been rupturing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not rupture
you could not rupture
he could not rupture
we could not rupture
you could not rupture
they could not rupture 	I could not be rupturing
you could not be rupturing
he could not be rupturing
we could not be rupturing
you could not be rupturing
they could not be rupturing	I could not have ruptured
you could not have ruptured
he could not have ruptured
we could not have ruptured
you could not have ruptured
they could not have ruptured	I could not have been rupturing
you could not have been rupturing
he could not have been rupturing
we could not have been rupturing
you could not have been rupturing
they could not have been rupturing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rupture?
could you rupture?
could he rupture?
could we rupture?
could you rupture?
could they rupture? 	could I be rupturing?
could you be rupturing?
could he be rupturing?
could we be rupturing?
could you be rupturing?
could they be rupturing? 	could I have ruptured?
could you have ruptured?
could he have ruptured?
could we have ruptured?
could you have ruptured?
could they have ruptured? 	could I have been rupturing?
could you have been rupturing?
could he have been rupturing?
could we have been rupturing?
could you have been rupturing?
could they have been rupturing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not rupture?
could you not rupture?
could he not rupture?
could we not rupture?
could you not rupture?
could they not rupture? 	could I not be rupturing?
could you not be rupturing?
could he not be rupturing?
could we not be rupturing?
could you not be rupturing?
could they not be rupturing? 	could I not have ruptured?
could you not have ruptured?
could he not have ruptured?
could we not have ruptured?
could you not have ruptured?
could they not have ruptured? 	could I not have been rupturing?
could you not have been rupturing?
could he not have been rupturing?
could we not have been rupturing?
could you not have been rupturing?
could they not have been rupturing?