English verb conjugation
COULD PREEXCHANGE

Regular verb: preexchange - preexchanged - preexchanged

Affirmation

Simple form	V-ing form
I could preexchange you could preexchange he could preexchange we could preexchange you could preexchange they could preexchange	I could be preexchanging you could be preexchanging he could be preexchanging we could be preexchanging you could be preexchanging they could be preexchanging
Perfect	V-ing perfect
I could have preexchanged you could have preexchanged he could have preexchanged we could have preexchanged you could have preexchanged they could have preexchanged	I could have been preexchanging you could have been preexchanging he could have been preexchanging we could have been preexchanging you could have been preexchanging they could have been preexchanging

Negation

Simple form	V-ing form
I could not preexchange you could not preexchange he could not preexchange we could not preexchange you could not preexchange they could not preexchange	I could not be preexchanging you could not be preexchanging he could not be preexchanging we could not be preexchanging you could not be preexchanging they could not be preexchanging
Perfect	V-ing perfect
I could not have preexchanged you could not have preexchanged he could not have preexchanged we could not have preexchanged you could not have preexchanged they could not have preexchanged	I could not have been preexchanging you could not have been preexchanging he could not have been preexchanging we could not have been preexchanging you could not have been preexchanging they could not have been preexchanging

Interrogative form

Simple form	V-ing form
could I preexchange? could you preexchange? could he preexchange? could we preexchange? could you preexchange? could they preexchange?	could I be preexchanging? could you be preexchanging? could he be preexchanging? could we be preexchanging? could you be preexchanging? could they be preexchanging?
Perfect	V-ing perfect
could I have preexchanged? could you have preexchanged? could he have preexchanged? could we have preexchanged? could you have preexchanged? could they have preexchanged?	could I have been preexchanging? could you have been preexchanging? could he have been preexchanging? could we have been preexchanging? could you have been preexchanging? could they have been preexchanging?

Interro-negative form

Simple form	V-ing form
could I not preexchange? could you not preexchange? could he not preexchange? could we not preexchange? could you not preexchange? could they not preexchange?	could I not be preexchanging? could you not be preexchanging? could he not be preexchanging? could we not be preexchanging? could you not be preexchanging? could they not be preexchanging?
Perfect	V-ing perfect
could I not have preexchanged? could you not have preexchanged? could he not have preexchanged? could we not have preexchanged? could you not have preexchanged? could they not have preexchanged?	could I not have been preexchanging? could you not have been preexchanging? could he not have been preexchanging? could we not have been preexchanging? could you not have been preexchanging? could they not have been preexchanging?