I could canoe you could canoe he could canoe we could canoe you could canoe they could canoe
V-ing form
I could be canoing you could be canoing he could be canoing we could be canoing you could be canoing they could be canoing
Perfect
I could have canoed you could have canoed he could have canoed we could have canoed you could have canoed they could have canoed
V-ing perfect
I could have been canoing you could have been canoing he could have been canoing we could have been canoing you could have been canoing they could have been canoing
Negation
Simple form
I could not canoe you could not canoe he could not canoe we could not canoe you could not canoe they could not canoe
V-ing form
I could not be canoing you could not be canoing he could not be canoing we could not be canoing you could not be canoing they could not be canoing
Perfect
I could not have canoed you could not have canoed he could not have canoed we could not have canoed you could not have canoed they could not have canoed
V-ing perfect
I could not have been canoing you could not have been canoing he could not have been canoing we could not have been canoing you could not have been canoing they could not have been canoing
Interrogative form
Simple form
could I canoe? could you canoe? could he canoe? could we canoe? could you canoe? could they canoe?
V-ing form
could I be canoing? could you be canoing? could he be canoing? could we be canoing? could you be canoing? could they be canoing?
Perfect
could I have canoed? could you have canoed? could he have canoed? could we have canoed? could you have canoed? could they have canoed?
V-ing perfect
could I have been canoing? could you have been canoing? could he have been canoing? could we have been canoing? could you have been canoing? could they have been canoing?
Interro-negative form
Simple form
could I not canoe? could you not canoe? could he not canoe? could we not canoe? could you not canoe? could they not canoe?
V-ing form
could I not be canoing? could you not be canoing? could he not be canoing? could we not be canoing? could you not be canoing? could they not be canoing?
Perfect
could I not have canoed? could you not have canoed? could he not have canoed? could we not have canoed? could you not have canoed? could they not have canoed?
V-ing perfect
could I not have been canoing? could you not have been canoing? could he not have been canoing? could we not have been canoing? could you not have been canoing? could they not have been canoing?