English verb conjugation
COULD ERUPT

Regular verb: erupt - erupted - erupted

Affirmation

Simple form	V-ing form
I could erupt you could erupt she could erupt we could erupt you could erupt they could erupt	I could be erupting you could be erupting she 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 she 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 she 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 she 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 she 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 she 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 she 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 she erupt? could we erupt? could you erupt? could they erupt?	could I be erupting? could you be erupting? could she 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 she 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 she 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 she 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 she 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 she 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 she have been erupting? couldn't we have been erupting? couldn't you have been erupting? couldn't they have been erupting?