I could kernel you could kernel he could kernel we could kernel you could kernel they could kernel
V-ing form
I could be kerneling you could be kerneling he could be kerneling we could be kerneling you could be kerneling they could be kerneling
Perfect
I could have kerneled you could have kerneled he could have kerneled we could have kerneled you could have kerneled they could have kerneled
V-ing perfect
I could have been kerneling you could have been kerneling he could have been kerneling we could have been kerneling you could have been kerneling they could have been kerneling
Negation
Simple form
I could not kernel you could not kernel he could not kernel we could not kernel you could not kernel they could not kernel
V-ing form
I could not be kerneling you could not be kerneling he could not be kerneling we could not be kerneling you could not be kerneling they could not be kerneling
Perfect
I could not have kerneled you could not have kerneled he could not have kerneled we could not have kerneled you could not have kerneled they could not have kerneled
V-ing perfect
I could not have been kerneling you could not have been kerneling he could not have been kerneling we could not have been kerneling you could not have been kerneling they could not have been kerneling
Interrogative form
Simple form
could I kernel? could you kernel? could he kernel? could we kernel? could you kernel? could they kernel?
V-ing form
could I be kerneling? could you be kerneling? could he be kerneling? could we be kerneling? could you be kerneling? could they be kerneling?
Perfect
could I have kerneled? could you have kerneled? could he have kerneled? could we have kerneled? could you have kerneled? could they have kerneled?
V-ing perfect
could I have been kerneling? could you have been kerneling? could he have been kerneling? could we have been kerneling? could you have been kerneling? could they have been kerneling?
Interro-negative form
Simple form
could I not kernel? could you not kernel? could he not kernel? could we not kernel? could you not kernel? could they not kernel?
V-ing form
could I not be kerneling? could you not be kerneling? could he not be kerneling? could we not be kerneling? could you not be kerneling? could they not be kerneling?
Perfect
could I not have kerneled? could you not have kerneled? could he not have kerneled? could we not have kerneled? could you not have kerneled? could they not have kerneled?
V-ing perfect
could I not have been kerneling? could you not have been kerneling? could he not have been kerneling? could we not have been kerneling? could you not have been kerneling? could they not have been kerneling?