English verb conjugation
COULD PRESOLVE

Regular verb: presolve - presolved - presolved

Affirmation

Simple form	V-ing form
I could presolve you could presolve he could presolve we could presolve you could presolve they could presolve	I could be presolving you could be presolving he could be presolving we could be presolving you could be presolving they could be presolving
Perfect	V-ing perfect
I could have presolved you could have presolved he could have presolved we could have presolved you could have presolved they could have presolved	I could have been presolving you could have been presolving he could have been presolving we could have been presolving you could have been presolving they could have been presolving

Negation

Simple form	V-ing form
I could not presolve you could not presolve he could not presolve we could not presolve you could not presolve they could not presolve	I could not be presolving you could not be presolving he could not be presolving we could not be presolving you could not be presolving they could not be presolving
Perfect	V-ing perfect
I could not have presolved you could not have presolved he could not have presolved we could not have presolved you could not have presolved they could not have presolved	I could not have been presolving you could not have been presolving he could not have been presolving we could not have been presolving you could not have been presolving they could not have been presolving

Interrogative form

Simple form	V-ing form
could I presolve? could you presolve? could he presolve? could we presolve? could you presolve? could they presolve?	could I be presolving? could you be presolving? could he be presolving? could we be presolving? could you be presolving? could they be presolving?
Perfect	V-ing perfect
could I have presolved? could you have presolved? could he have presolved? could we have presolved? could you have presolved? could they have presolved?	could I have been presolving? could you have been presolving? could he have been presolving? could we have been presolving? could you have been presolving? could they have been presolving?

Interro-negative form

Simple form	V-ing form
could I not presolve? could you not presolve? could he not presolve? could we not presolve? could you not presolve? could they not presolve?	could I not be presolving? could you not be presolving? could he not be presolving? could we not be presolving? could you not be presolving? could they not be presolving?
Perfect	V-ing perfect
could I not have presolved? could you not have presolved? could he not have presolved? could we not have presolved? could you not have presolved? could they not have presolved?	could I not have been presolving? could you not have been presolving? could he not have been presolving? could we not have been presolving? could you not have been presolving? could they not have been presolving?