English verb conjugation
COULD SURGE

Regular verb: surge - surged - surged

Affirmation

Simple form	V-ing form
I could surge you could surge she could surge we could surge you could surge they could surge	I could be surging you could be surging she could be surging we could be surging you could be surging they could be surging
Perfect	V-ing perfect
I could have surged you could have surged she could have surged we could have surged you could have surged they could have surged	I could have been surging you could have been surging she could have been surging we could have been surging you could have been surging they could have been surging

Negation

Simple form	V-ing form
I couldn't surge you couldn't surge she couldn't surge we couldn't surge you couldn't surge they couldn't surge	I couldn't be surging you couldn't be surging she couldn't be surging we couldn't be surging you couldn't be surging they couldn't be surging
Perfect	V-ing perfect
I couldn't have surged you couldn't have surged she couldn't have surged we couldn't have surged you couldn't have surged they couldn't have surged	I couldn't have been surging you couldn't have been surging she couldn't have been surging we couldn't have been surging you couldn't have been surging they couldn't have been surging

Interrogative form

Simple form	V-ing form
could I surge? could you surge? could she surge? could we surge? could you surge? could they surge?	could I be surging? could you be surging? could she be surging? could we be surging? could you be surging? could they be surging?
Perfect	V-ing perfect
could I have surged? could you have surged? could she have surged? could we have surged? could you have surged? could they have surged?	could I have been surging? could you have been surging? could she have been surging? could we have been surging? could you have been surging? could they have been surging?

Interro-negative form

Simple form	V-ing form
couldn't I surge? couldn't you surge? couldn't she surge? couldn't we surge? couldn't you surge? couldn't they surge?	couldn't I be surging? couldn't you be surging? couldn't she be surging? couldn't we be surging? couldn't you be surging? couldn't they be surging?
Perfect	V-ing perfect
couldn't I have surged? couldn't you have surged? couldn't she have surged? couldn't we have surged? couldn't you have surged? couldn't they have surged?	couldn't I have been surging? couldn't you have been surging? couldn't she have been surging? couldn't we have been surging? couldn't you have been surging? couldn't they have been surging?