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