English verb conjugation
COULD SUBMERGE

Regular verb: submerge - submerged - submerged

Affirmation

Simple form	V-ing form
I could submerge you could submerge he could submerge we could submerge you could submerge they could submerge	I could be submerging you could be submerging he could be submerging we could be submerging you could be submerging they could be submerging
Perfect	V-ing perfect
I could have submerged you could have submerged he could have submerged we could have submerged you could have submerged they could have submerged	I could have been submerging you could have been submerging he could have been submerging we could have been submerging you could have been submerging they could have been submerging

Negation

Simple form	V-ing form
I couldn't submerge you couldn't submerge he couldn't submerge we couldn't submerge you couldn't submerge they couldn't submerge	I couldn't be submerging you couldn't be submerging he couldn't be submerging we couldn't be submerging you couldn't be submerging they couldn't be submerging
Perfect	V-ing perfect
I couldn't have submerged you couldn't have submerged he couldn't have submerged we couldn't have submerged you couldn't have submerged they couldn't have submerged	I couldn't have been submerging you couldn't have been submerging he couldn't have been submerging we couldn't have been submerging you couldn't have been submerging they couldn't have been submerging

Interrogative form

Simple form	V-ing form
could I submerge? could you submerge? could he submerge? could we submerge? could you submerge? could they submerge?	could I be submerging? could you be submerging? could he be submerging? could we be submerging? could you be submerging? could they be submerging?
Perfect	V-ing perfect
could I have submerged? could you have submerged? could he have submerged? could we have submerged? could you have submerged? could they have submerged?	could I have been submerging? could you have been submerging? could he have been submerging? could we have been submerging? could you have been submerging? could they have been submerging?

Interro-negative form

Simple form	V-ing form
couldn't I submerge? couldn't you submerge? couldn't he submerge? couldn't we submerge? couldn't you submerge? couldn't they submerge?	couldn't I be submerging? couldn't you be submerging? couldn't he be submerging? couldn't we be submerging? couldn't you be submerging? couldn't they be submerging?
Perfect	V-ing perfect
couldn't I have submerged? couldn't you have submerged? couldn't he have submerged? couldn't we have submerged? couldn't you have submerged? couldn't they have submerged?	couldn't I have been submerging? couldn't you have been submerging? couldn't he have been submerging? couldn't we have been submerging? couldn't you have been submerging? couldn't they have been submerging?