I could spread you could spread she could spread we could spread you could spread they could spread
V-ing form
I could be spreading you could be spreading she could be spreading we could be spreading you could be spreading they could be spreading
Perfect
I could have spread you could have spread she could have spread we could have spread you could have spread they could have spread
V-ing perfect
I could have been spreading you could have been spreading she could have been spreading we could have been spreading you could have been spreading they could have been spreading
Negation
Simple form
I could not spread you could not spread she could not spread we could not spread you could not spread they could not spread
V-ing form
I could not be spreading you could not be spreading she could not be spreading we could not be spreading you could not be spreading they could not be spreading
Perfect
I could not have spread you could not have spread she could not have spread we could not have spread you could not have spread they could not have spread
V-ing perfect
I could not have been spreading you could not have been spreading she could not have been spreading we could not have been spreading you could not have been spreading they could not have been spreading
Interrogative form
Simple form
could I spread? could you spread? could she spread? could we spread? could you spread? could they spread?
V-ing form
could I be spreading? could you be spreading? could she be spreading? could we be spreading? could you be spreading? could they be spreading?
Perfect
could I have spread? could you have spread? could she have spread? could we have spread? could you have spread? could they have spread?
V-ing perfect
could I have been spreading? could you have been spreading? could she have been spreading? could we have been spreading? could you have been spreading? could they have been spreading?
Interro-negative form
Simple form
could I not spread? could you not spread? could she not spread? could we not spread? could you not spread? could they not spread?
V-ing form
could I not be spreading? could you not be spreading? could she not be spreading? could we not be spreading? could you not be spreading? could they not be spreading?
Perfect
could I not have spread? could you not have spread? could she not have spread? could we not have spread? could you not have spread? could they not have spread?
V-ing perfect
could I not have been spreading? could you not have been spreading? could she not have been spreading? could we not have been spreading? could you not have been spreading? could they not have been spreading?