could evolve
Regular verb: evolve - evolved- evolved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could evolve
you could evolve
she could evolve
we could evolve
you could evolve
they could evolve 	I could be evolving
you could be evolving
she could be evolving
we could be evolving
you could be evolving
they could be evolving	I could have evolved
you could have evolved
she could have evolved
we could have evolved
you could have evolved
they could have evolved	I could have been evolving
you could have been evolving
she could have been evolving
we could have been evolving
you could have been evolving
they could have been evolving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not evolve
you could not evolve
she could not evolve
we could not evolve
you could not evolve
they could not evolve 	I could not be evolving
you could not be evolving
she could not be evolving
we could not be evolving
you could not be evolving
they could not be evolving	I could not have evolved
you could not have evolved
she could not have evolved
we could not have evolved
you could not have evolved
they could not have evolved	I could not have been evolving
you could not have been evolving
she could not have been evolving
we could not have been evolving
you could not have been evolving
they could not have been evolving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I evolve?
could you evolve?
could she evolve?
could we evolve?
could you evolve?
could they evolve? 	could I be evolving?
could you be evolving?
could she be evolving?
could we be evolving?
could you be evolving?
could they be evolving? 	could I have evolved?
could you have evolved?
could she have evolved?
could we have evolved?
could you have evolved?
could they have evolved? 	could I have been evolving?
could you have been evolving?
could she have been evolving?
could we have been evolving?
could you have been evolving?
could they have been evolving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not evolve?
could you not evolve?
could she not evolve?
could we not evolve?
could you not evolve?
could they not evolve? 	could I not be evolving?
could you not be evolving?
could she not be evolving?
could we not be evolving?
could you not be evolving?
could they not be evolving? 	could I not have evolved?
could you not have evolved?
could she not have evolved?
could we not have evolved?
could you not have evolved?
could they not have evolved? 	could I not have been evolving?
could you not have been evolving?
could she not have been evolving?
could we not have been evolving?
could you not have been evolving?
could they not have been evolving?