English verb conjugation
COULD DISPLAY

Regular verb: display - displayed - displayed

Affirmation

Simple form	V-ing form
I could display you could display she could display we could display you could display they could display	I could be displaying you could be displaying she could be displaying we could be displaying you could be displaying they could be displaying
Perfect	V-ing perfect
I could have displayed you could have displayed she could have displayed we could have displayed you could have displayed they could have displayed	I could have been displaying you could have been displaying she could have been displaying we could have been displaying you could have been displaying they could have been displaying

Negation

Simple form	V-ing form
I could not display you could not display she could not display we could not display you could not display they could not display	I could not be displaying you could not be displaying she could not be displaying we could not be displaying you could not be displaying they could not be displaying
Perfect	V-ing perfect
I could not have displayed you could not have displayed she could not have displayed we could not have displayed you could not have displayed they could not have displayed	I could not have been displaying you could not have been displaying she could not have been displaying we could not have been displaying you could not have been displaying they could not have been displaying

Interrogative form

Simple form	V-ing form
could I display? could you display? could she display? could we display? could you display? could they display?	could I be displaying? could you be displaying? could she be displaying? could we be displaying? could you be displaying? could they be displaying?
Perfect	V-ing perfect
could I have displayed? could you have displayed? could she have displayed? could we have displayed? could you have displayed? could they have displayed?	could I have been displaying? could you have been displaying? could she have been displaying? could we have been displaying? could you have been displaying? could they have been displaying?

Interro-negative form

Simple form	V-ing form
could I not display? could you not display? could she not display? could we not display? could you not display? could they not display?	could I not be displaying? could you not be displaying? could she not be displaying? could we not be displaying? could you not be displaying? could they not be displaying?
Perfect	V-ing perfect
could I not have displayed? could you not have displayed? could she not have displayed? could we not have displayed? could you not have displayed? could they not have displayed?	could I not have been displaying? could you not have been displaying? could she not have been displaying? could we not have been displaying? could you not have been displaying? could they not have been displaying?