English verb conjugation
COULD EVOLVE

Regular verb: evolve - evolved - evolved

Affirmation

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