English verb conjugation
COULD XEROX

Regular verb: xerox - xeroxed - xeroxed

Affirmation

Simple form	V-ing form
I could xerox you could xerox he could xerox we could xerox you could xerox they could xerox	I could be xeroxing you could be xeroxing he could be xeroxing we could be xeroxing you could be xeroxing they could be xeroxing
Perfect	V-ing perfect
I could have xeroxed you could have xeroxed he could have xeroxed we could have xeroxed you could have xeroxed they could have xeroxed	I could have been xeroxing you could have been xeroxing he could have been xeroxing we could have been xeroxing you could have been xeroxing they could have been xeroxing

Negation

Simple form	V-ing form
I couldn't xerox you couldn't xerox he couldn't xerox we couldn't xerox you couldn't xerox they couldn't xerox	I couldn't be xeroxing you couldn't be xeroxing he couldn't be xeroxing we couldn't be xeroxing you couldn't be xeroxing they couldn't be xeroxing
Perfect	V-ing perfect
I couldn't have xeroxed you couldn't have xeroxed he couldn't have xeroxed we couldn't have xeroxed you couldn't have xeroxed they couldn't have xeroxed	I couldn't have been xeroxing you couldn't have been xeroxing he couldn't have been xeroxing we couldn't have been xeroxing you couldn't have been xeroxing they couldn't have been xeroxing

Interrogative form

Simple form	V-ing form
could I xerox? could you xerox? could he xerox? could we xerox? could you xerox? could they xerox?	could I be xeroxing? could you be xeroxing? could he be xeroxing? could we be xeroxing? could you be xeroxing? could they be xeroxing?
Perfect	V-ing perfect
could I have xeroxed? could you have xeroxed? could he have xeroxed? could we have xeroxed? could you have xeroxed? could they have xeroxed?	could I have been xeroxing? could you have been xeroxing? could he have been xeroxing? could we have been xeroxing? could you have been xeroxing? could they have been xeroxing?

Interro-negative form

Simple form	V-ing form
couldn't I xerox? couldn't you xerox? couldn't he xerox? couldn't we xerox? couldn't you xerox? couldn't they xerox?	couldn't I be xeroxing? couldn't you be xeroxing? couldn't he be xeroxing? couldn't we be xeroxing? couldn't you be xeroxing? couldn't they be xeroxing?
Perfect	V-ing perfect
couldn't I have xeroxed? couldn't you have xeroxed? couldn't he have xeroxed? couldn't we have xeroxed? couldn't you have xeroxed? couldn't they have xeroxed?	couldn't I have been xeroxing? couldn't you have been xeroxing? couldn't he have been xeroxing? couldn't we have been xeroxing? couldn't you have been xeroxing? couldn't they have been xeroxing?