I could shout you could shout she could shout we could shout you could shout they could shout
V-ing form
I could be shouting you could be shouting she could be shouting we could be shouting you could be shouting they could be shouting
Perfect
I could have shouted you could have shouted she 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 she 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 she 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 she 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 she 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 she 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 she shout? could we shout? could you shout? could they shout?
V-ing form
could I be shouting? could you be shouting? could she be shouting? could we be shouting? could you be shouting? could they be shouting?
Perfect
could I have shouted? could you have shouted? could she 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 she 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 she 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 she 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 she 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 she have been shouting? couldn't we have been shouting? couldn't you have been shouting? couldn't they have been shouting?