I could glimpse you could glimpse she could glimpse we could glimpse you could glimpse they could glimpse
V-ing form
I could be glimpsing you could be glimpsing she could be glimpsing we could be glimpsing you could be glimpsing they could be glimpsing
Perfect
I could have glimpsed you could have glimpsed she could have glimpsed we could have glimpsed you could have glimpsed they could have glimpsed
V-ing perfect
I could have been glimpsing you could have been glimpsing she could have been glimpsing we could have been glimpsing you could have been glimpsing they could have been glimpsing
Negation
Simple form
I could not glimpse you could not glimpse she could not glimpse we could not glimpse you could not glimpse they could not glimpse
V-ing form
I could not be glimpsing you could not be glimpsing she could not be glimpsing we could not be glimpsing you could not be glimpsing they could not be glimpsing
Perfect
I could not have glimpsed you could not have glimpsed she could not have glimpsed we could not have glimpsed you could not have glimpsed they could not have glimpsed
V-ing perfect
I could not have been glimpsing you could not have been glimpsing she could not have been glimpsing we could not have been glimpsing you could not have been glimpsing they could not have been glimpsing
Interrogative form
Simple form
could I glimpse? could you glimpse? could she glimpse? could we glimpse? could you glimpse? could they glimpse?
V-ing form
could I be glimpsing? could you be glimpsing? could she be glimpsing? could we be glimpsing? could you be glimpsing? could they be glimpsing?
Perfect
could I have glimpsed? could you have glimpsed? could she have glimpsed? could we have glimpsed? could you have glimpsed? could they have glimpsed?
V-ing perfect
could I have been glimpsing? could you have been glimpsing? could she have been glimpsing? could we have been glimpsing? could you have been glimpsing? could they have been glimpsing?
Interro-negative form
Simple form
could I not glimpse? could you not glimpse? could she not glimpse? could we not glimpse? could you not glimpse? could they not glimpse?
V-ing form
could I not be glimpsing? could you not be glimpsing? could she not be glimpsing? could we not be glimpsing? could you not be glimpsing? could they not be glimpsing?
Perfect
could I not have glimpsed? could you not have glimpsed? could she not have glimpsed? could we not have glimpsed? could you not have glimpsed? could they not have glimpsed?
V-ing perfect
could I not have been glimpsing? could you not have been glimpsing? could she not have been glimpsing? could we not have been glimpsing? could you not have been glimpsing? could they not have been glimpsing?