I could subdue you could subdue he could subdue we could subdue you could subdue they could subdue
V-ing form
I could be subduing you could be subduing he could be subduing we could be subduing you could be subduing they could be subduing
Perfect
I could have subdued you could have subdued he could have subdued we could have subdued you could have subdued they could have subdued
V-ing perfect
I could have been subduing you could have been subduing he could have been subduing we could have been subduing you could have been subduing they could have been subduing
Negation
Simple form
I could not subdue you could not subdue he could not subdue we could not subdue you could not subdue they could not subdue
V-ing form
I could not be subduing you could not be subduing he could not be subduing we could not be subduing you could not be subduing they could not be subduing
Perfect
I could not have subdued you could not have subdued he could not have subdued we could not have subdued you could not have subdued they could not have subdued
V-ing perfect
I could not have been subduing you could not have been subduing he could not have been subduing we could not have been subduing you could not have been subduing they could not have been subduing
Interrogative form
Simple form
could I subdue? could you subdue? could he subdue? could we subdue? could you subdue? could they subdue?
V-ing form
could I be subduing? could you be subduing? could he be subduing? could we be subduing? could you be subduing? could they be subduing?
Perfect
could I have subdued? could you have subdued? could he have subdued? could we have subdued? could you have subdued? could they have subdued?
V-ing perfect
could I have been subduing? could you have been subduing? could he have been subduing? could we have been subduing? could you have been subduing? could they have been subduing?
Interro-negative form
Simple form
could I not subdue? could you not subdue? could he not subdue? could we not subdue? could you not subdue? could they not subdue?
V-ing form
could I not be subduing? could you not be subduing? could he not be subduing? could we not be subduing? could you not be subduing? could they not be subduing?
Perfect
could I not have subdued? could you not have subdued? could he not have subdued? could we not have subdued? could you not have subdued? could they not have subdued?
V-ing perfect
could I not have been subduing? could you not have been subduing? could he not have been subduing? could we not have been subduing? could you not have been subduing? could they not have been subduing?