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 couldn't preexchange you couldn't preexchange he couldn't preexchange we couldn't preexchange you couldn't preexchange they couldn't preexchange	I couldn't be preexchanging you couldn't be preexchanging he couldn't be preexchanging we couldn't be preexchanging you couldn't be preexchanging they couldn't be preexchanging
Perfect	V-ing perfect
I couldn't have preexchanged you couldn't have preexchanged he couldn't have preexchanged we couldn't have preexchanged you couldn't have preexchanged they couldn't have preexchanged	I couldn't have been preexchanging you couldn't have been preexchanging he couldn't have been preexchanging we couldn't have been preexchanging you couldn't have been preexchanging they couldn't 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
couldn't I preexchange? couldn't you preexchange? couldn't he preexchange? couldn't we preexchange? couldn't you preexchange? couldn't they preexchange?	couldn't I be preexchanging? couldn't you be preexchanging? couldn't he be preexchanging? couldn't we be preexchanging? couldn't you be preexchanging? couldn't they be preexchanging?
Perfect	V-ing perfect
couldn't I have preexchanged? couldn't you have preexchanged? couldn't he have preexchanged? couldn't we have preexchanged? couldn't you have preexchanged? couldn't they have preexchanged?	couldn't I have been preexchanging? couldn't you have been preexchanging? couldn't he have been preexchanging? couldn't we have been preexchanging? couldn't you have been preexchanging? couldn't they have been preexchanging?