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