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