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