English verb conjugation
COULD RUPTURE

Regular verb: rupture - ruptured - ruptured

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I couldn't rupture you couldn't rupture he couldn't rupture we couldn't rupture you couldn't rupture they couldn't rupture	I couldn't be rupturing you couldn't be rupturing he couldn't be rupturing we couldn't be rupturing you couldn't be rupturing they couldn't be rupturing
Perfect	V-ing perfect
I couldn't have ruptured you couldn't have ruptured he couldn't have ruptured we couldn't have ruptured you couldn't have ruptured they couldn't have ruptured	I couldn't have been rupturing you couldn't have been rupturing he couldn't have been rupturing we couldn't have been rupturing you couldn't have been rupturing they couldn't have been rupturing

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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
couldn't I rupture? couldn't you rupture? couldn't he rupture? couldn't we rupture? couldn't you rupture? couldn't they rupture?	couldn't I be rupturing? couldn't you be rupturing? couldn't he be rupturing? couldn't we be rupturing? couldn't you be rupturing? couldn't they be rupturing?
Perfect	V-ing perfect
couldn't I have ruptured? couldn't you have ruptured? couldn't he have ruptured? couldn't we have ruptured? couldn't you have ruptured? couldn't they have ruptured?	couldn't I have been rupturing? couldn't you have been rupturing? couldn't he have been rupturing? couldn't we have been rupturing? couldn't you have been rupturing? couldn't they have been rupturing?