could presolve
Regular verb: presolve - presolved- presolved

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could presolve
you could presolve
she could presolve
we could presolve
you could presolve
they could presolve 	I could be presolving
you could be presolving
she could be presolving
we could be presolving
you could be presolving
they could be presolving	I could have presolved
you could have presolved
she 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
she 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 	Perfect 	V-ing perfect 	
I couldn't presolve
you couldn't presolve
she couldn't presolve
we couldn't presolve
you couldn't presolve
they couldn't presolve 	I couldn't be presolving
you couldn't be presolving
she couldn't be presolving
we couldn't be presolving
you couldn't be presolving
they couldn't be presolving	I couldn't have presolved
you couldn't have presolved
she couldn't have presolved
we couldn't have presolved
you couldn't have presolved
they couldn't have presolved	I couldn't have been presolving
you couldn't have been presolving
she couldn't have been presolving
we couldn't have been presolving
you couldn't have been presolving
they couldn't have been presolving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I presolve?
could you presolve?
could she presolve?
could we presolve?
could you presolve?
could they presolve? 	could I be presolving?
could you be presolving?
could she be presolving?
could we be presolving?
could you be presolving?
could they be presolving? 	could I have presolved?
could you have presolved?
could she 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 she 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 	Perfect 	V-ing perfect 	
couldn't I presolve?
couldn't you presolve?
couldn't she presolve?
couldn't we presolve?
couldn't you presolve?
couldn't they presolve? 	couldn't I be presolving?
couldn't you be presolving?
couldn't she be presolving?
couldn't we be presolving?
couldn't you be presolving?
couldn't they be presolving? 	couldn't I have presolved?
couldn't you have presolved?
couldn't she have presolved?
couldn't we have presolved?
couldn't you have presolved?
couldn't they have presolved? 	couldn't I have been presolving?
couldn't you have been presolving?
couldn't she have been presolving?
couldn't we have been presolving?
couldn't you have been presolving?
couldn't they have been presolving?