English verb conjugation
COULD ERUPT

Regular verb: erupt - erupted - erupted

Affirmation

Simple form	V-ing form
I could erupt you could erupt he could erupt we could erupt you could erupt they could erupt	I could be erupting you could be erupting he could be erupting we could be erupting you could be erupting they could be erupting
Perfect	V-ing perfect
I could have erupted you could have erupted he could have erupted we could have erupted you could have erupted they could have erupted	I could have been erupting you could have been erupting he could have been erupting we could have been erupting you could have been erupting they could have been erupting

Negation

Simple form	V-ing form
I couldn't erupt you couldn't erupt he couldn't erupt we couldn't erupt you couldn't erupt they couldn't erupt	I couldn't be erupting you couldn't be erupting he couldn't be erupting we couldn't be erupting you couldn't be erupting they couldn't be erupting
Perfect	V-ing perfect
I couldn't have erupted you couldn't have erupted he couldn't have erupted we couldn't have erupted you couldn't have erupted they couldn't have erupted	I couldn't have been erupting you couldn't have been erupting he couldn't have been erupting we couldn't have been erupting you couldn't have been erupting they couldn't have been erupting

Interrogative form

Simple form	V-ing form
could I erupt? could you erupt? could he erupt? could we erupt? could you erupt? could they erupt?	could I be erupting? could you be erupting? could he be erupting? could we be erupting? could you be erupting? could they be erupting?
Perfect	V-ing perfect
could I have erupted? could you have erupted? could he have erupted? could we have erupted? could you have erupted? could they have erupted?	could I have been erupting? could you have been erupting? could he have been erupting? could we have been erupting? could you have been erupting? could they have been erupting?

Interro-negative form

Simple form	V-ing form
couldn't I erupt? couldn't you erupt? couldn't he erupt? couldn't we erupt? couldn't you erupt? couldn't they erupt?	couldn't I be erupting? couldn't you be erupting? couldn't he be erupting? couldn't we be erupting? couldn't you be erupting? couldn't they be erupting?
Perfect	V-ing perfect
couldn't I have erupted? couldn't you have erupted? couldn't he have erupted? couldn't we have erupted? couldn't you have erupted? couldn't they have erupted?	couldn't I have been erupting? couldn't you have been erupting? couldn't he have been erupting? couldn't we have been erupting? couldn't you have been erupting? couldn't they have been erupting?