English verb conjugation
COULD PHOTOGRAPH

Regular verb: photograph - photographed - photographed

Affirmation

Simple form	V-ing form
I could photograph you could photograph she could photograph we could photograph you could photograph they could photograph	I could be photographing you could be photographing she could be photographing we could be photographing you could be photographing they could be photographing
Perfect	V-ing perfect
I could have photographed you could have photographed she could have photographed we could have photographed you could have photographed they could have photographed	I could have been photographing you could have been photographing she could have been photographing we could have been photographing you could have been photographing they could have been photographing

Negation

Simple form	V-ing form
I couldn't photograph you couldn't photograph she couldn't photograph we couldn't photograph you couldn't photograph they couldn't photograph	I couldn't be photographing you couldn't be photographing she couldn't be photographing we couldn't be photographing you couldn't be photographing they couldn't be photographing
Perfect	V-ing perfect
I couldn't have photographed you couldn't have photographed she couldn't have photographed we couldn't have photographed you couldn't have photographed they couldn't have photographed	I couldn't have been photographing you couldn't have been photographing she couldn't have been photographing we couldn't have been photographing you couldn't have been photographing they couldn't have been photographing

Interrogative form

Simple form	V-ing form
could I photograph? could you photograph? could she photograph? could we photograph? could you photograph? could they photograph?	could I be photographing? could you be photographing? could she be photographing? could we be photographing? could you be photographing? could they be photographing?
Perfect	V-ing perfect
could I have photographed? could you have photographed? could she have photographed? could we have photographed? could you have photographed? could they have photographed?	could I have been photographing? could you have been photographing? could she have been photographing? could we have been photographing? could you have been photographing? could they have been photographing?

Interro-negative form

Simple form	V-ing form
couldn't I photograph? couldn't you photograph? couldn't she photograph? couldn't we photograph? couldn't you photograph? couldn't they photograph?	couldn't I be photographing? couldn't you be photographing? couldn't she be photographing? couldn't we be photographing? couldn't you be photographing? couldn't they be photographing?
Perfect	V-ing perfect
couldn't I have photographed? couldn't you have photographed? couldn't she have photographed? couldn't we have photographed? couldn't you have photographed? couldn't they have photographed?	couldn't I have been photographing? couldn't you have been photographing? couldn't she have been photographing? couldn't we have been photographing? couldn't you have been photographing? couldn't they have been photographing?