I could blow you could blow he could blow we could blow you could blow they could blow
V-ing form
I could be blowing you could be blowing he could be blowing we could be blowing you could be blowing they could be blowing
Perfect
I could have blown you could have blown he could have blown we could have blown you could have blown they could have blown
V-ing perfect
I could have been blowing you could have been blowing he could have been blowing we could have been blowing you could have been blowing they could have been blowing
Negation
Simple form
I could not blow you could not blow he could not blow we could not blow you could not blow they could not blow
V-ing form
I could not be blowing you could not be blowing he could not be blowing we could not be blowing you could not be blowing they could not be blowing
Perfect
I could not have blown you could not have blown he could not have blown we could not have blown you could not have blown they could not have blown
V-ing perfect
I could not have been blowing you could not have been blowing he could not have been blowing we could not have been blowing you could not have been blowing they could not have been blowing
Interrogative form
Simple form
could I blow? could you blow? could he blow? could we blow? could you blow? could they blow?
V-ing form
could I be blowing? could you be blowing? could he be blowing? could we be blowing? could you be blowing? could they be blowing?
Perfect
could I have blown? could you have blown? could he have blown? could we have blown? could you have blown? could they have blown?
V-ing perfect
could I have been blowing? could you have been blowing? could he have been blowing? could we have been blowing? could you have been blowing? could they have been blowing?
Interro-negative form
Simple form
could I not blow? could you not blow? could he not blow? could we not blow? could you not blow? could they not blow?
V-ing form
could I not be blowing? could you not be blowing? could he not be blowing? could we not be blowing? could you not be blowing? could they not be blowing?
Perfect
could I not have blown? could you not have blown? could he not have blown? could we not have blown? could you not have blown? could they not have blown?
V-ing perfect
could I not have been blowing? could you not have been blowing? could he not have been blowing? could we not have been blowing? could you not have been blowing? could they not have been blowing?