I could gape you could gape he could gape we could gape you could gape they could gape
V-ing form
I could be gaping you could be gaping he could be gaping we could be gaping you could be gaping they could be gaping
Perfect
I could have gaped you could have gaped he could have gaped we could have gaped you could have gaped they could have gaped
V-ing perfect
I could have been gaping you could have been gaping he could have been gaping we could have been gaping you could have been gaping they could have been gaping
Negation
Simple form
I couldn't gape you couldn't gape he couldn't gape we couldn't gape you couldn't gape they couldn't gape
V-ing form
I couldn't be gaping you couldn't be gaping he couldn't be gaping we couldn't be gaping you couldn't be gaping they couldn't be gaping
Perfect
I couldn't have gaped you couldn't have gaped he couldn't have gaped we couldn't have gaped you couldn't have gaped they couldn't have gaped
V-ing perfect
I couldn't have been gaping you couldn't have been gaping he couldn't have been gaping we couldn't have been gaping you couldn't have been gaping they couldn't have been gaping
Interrogative form
Simple form
could I gape? could you gape? could he gape? could we gape? could you gape? could they gape?
V-ing form
could I be gaping? could you be gaping? could he be gaping? could we be gaping? could you be gaping? could they be gaping?
Perfect
could I have gaped? could you have gaped? could he have gaped? could we have gaped? could you have gaped? could they have gaped?
V-ing perfect
could I have been gaping? could you have been gaping? could he have been gaping? could we have been gaping? could you have been gaping? could they have been gaping?
Interro-negative form
Simple form
couldn't I gape? couldn't you gape? couldn't he gape? couldn't we gape? couldn't you gape? couldn't they gape?
V-ing form
couldn't I be gaping? couldn't you be gaping? couldn't he be gaping? couldn't we be gaping? couldn't you be gaping? couldn't they be gaping?
Perfect
couldn't I have gaped? couldn't you have gaped? couldn't he have gaped? couldn't we have gaped? couldn't you have gaped? couldn't they have gaped?
V-ing perfect
couldn't I have been gaping? couldn't you have been gaping? couldn't he have been gaping? couldn't we have been gaping? couldn't you have been gaping? couldn't they have been gaping?