could revolve
Regular verb: revolve - revolved- revolved

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