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