English verb conjugation
COULD INTERCHANGE

Regular verb: interchange - interchanged - interchanged

Affirmation

Simple form	V-ing form
I could interchange you could interchange she could interchange we could interchange you could interchange they could interchange	I could be interchanging you could be interchanging she could be interchanging we could be interchanging you could be interchanging they could be interchanging
Perfect	V-ing perfect
I could have interchanged you could have interchanged she could have interchanged we could have interchanged you could have interchanged they could have interchanged	I could have been interchanging you could have been interchanging she could have been interchanging we could have been interchanging you could have been interchanging they could have been interchanging

Negation

Simple form	V-ing form
I could not interchange you could not interchange she could not interchange we could not interchange you could not interchange they could not interchange	I could not be interchanging you could not be interchanging she could not be interchanging we could not be interchanging you could not be interchanging they could not be interchanging
Perfect	V-ing perfect
I could not have interchanged you could not have interchanged she could not have interchanged we could not have interchanged you could not have interchanged they could not have interchanged	I could not have been interchanging you could not have been interchanging she could not have been interchanging we could not have been interchanging you could not have been interchanging they could not have been interchanging

Interrogative form

Simple form	V-ing form
could I interchange? could you interchange? could she interchange? could we interchange? could you interchange? could they interchange?	could I be interchanging? could you be interchanging? could she be interchanging? could we be interchanging? could you be interchanging? could they be interchanging?
Perfect	V-ing perfect
could I have interchanged? could you have interchanged? could she have interchanged? could we have interchanged? could you have interchanged? could they have interchanged?	could I have been interchanging? could you have been interchanging? could she have been interchanging? could we have been interchanging? could you have been interchanging? could they have been interchanging?

Interro-negative form

Simple form	V-ing form
could I not interchange? could you not interchange? could she not interchange? could we not interchange? could you not interchange? could they not interchange?	could I not be interchanging? could you not be interchanging? could she not be interchanging? could we not be interchanging? could you not be interchanging? could they not be interchanging?
Perfect	V-ing perfect
could I not have interchanged? could you not have interchanged? could she not have interchanged? could we not have interchanged? could you not have interchanged? could they not have interchanged?	could I not have been interchanging? could you not have been interchanging? could she not have been interchanging? could we not have been interchanging? could you not have been interchanging? could they not have been interchanging?