English verb conjugation
COULD REVOLVE

Regular verb: revolve - revolved - revolved

Affirmation

Simple form	V-ing form
I could revolve you could revolve he could revolve we could revolve you could revolve they could revolve	I could be revolving you could be revolving he could be revolving we could be revolving you could be revolving they could be revolving
Perfect	V-ing perfect
I could have revolved you could have revolved he could have revolved we could have revolved you could have revolved they could have revolved	I could have been revolving you could have been revolving he could have been revolving we could have been revolving you could have been revolving they could have been revolving

Negation

Simple form	V-ing form
I couldn't revolve you couldn't revolve he couldn't revolve we couldn't revolve you couldn't revolve they couldn't revolve	I couldn't be revolving you couldn't be revolving he couldn't be revolving we couldn't be revolving you couldn't be revolving they couldn't be revolving
Perfect	V-ing perfect
I couldn't have revolved you couldn't have revolved he couldn't have revolved we couldn't have revolved you couldn't have revolved they couldn't have revolved	I couldn't have been revolving you couldn't have been revolving he couldn't have been revolving we couldn't have been revolving you couldn't have been revolving they couldn't have been revolving

Interrogative form

Simple form	V-ing form
could I revolve? could you revolve? could he revolve? could we revolve? could you revolve? could they revolve?	could I be revolving? could you be revolving? could he be revolving? could we be revolving? could you be revolving? could they be revolving?
Perfect	V-ing perfect
could I have revolved? could you have revolved? could he have revolved? could we have revolved? could you have revolved? could they have revolved?	could I have been revolving? could you have been revolving? could he have been revolving? could we have been revolving? could you have been revolving? could they have been revolving?

Interro-negative form

Simple form	V-ing form
couldn't I revolve? couldn't you revolve? couldn't he revolve? couldn't we revolve? couldn't you revolve? couldn't they revolve?	couldn't I be revolving? couldn't you be revolving? couldn't he be revolving? couldn't we be revolving? couldn't you be revolving? couldn't they be revolving?
Perfect	V-ing perfect
couldn't I have revolved? couldn't you have revolved? couldn't he have revolved? couldn't we have revolved? couldn't you have revolved? couldn't they have revolved?	couldn't I have been revolving? couldn't you have been revolving? couldn't he have been revolving? couldn't we have been revolving? couldn't you have been revolving? couldn't they have been revolving?