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