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