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