I could spread you could spread he could spread we could spread you could spread they could spread
V-ing form
I could be spreading you could be spreading he could be spreading we could be spreading you could be spreading they could be spreading
Perfect
I could have spread you could have spread he 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 he could have been spreading we could have been spreading you could have been spreading they could have been spreading
Negation
Simple form
I couldn't spread you couldn't spread he couldn't spread we couldn't spread you couldn't spread they couldn't spread
V-ing form
I couldn't be spreading you couldn't be spreading he couldn't be spreading we couldn't be spreading you couldn't be spreading they couldn't be spreading
Perfect
I couldn't have spread you couldn't have spread he couldn't have spread we couldn't have spread you couldn't have spread they couldn't have spread
V-ing perfect
I couldn't have been spreading you couldn't have been spreading he couldn't have been spreading we couldn't have been spreading you couldn't have been spreading they couldn't have been spreading
Interrogative form
Simple form
could I spread? could you spread? could he spread? could we spread? could you spread? could they spread?
V-ing form
could I be spreading? could you be spreading? could he be spreading? could we be spreading? could you be spreading? could they be spreading?
Perfect
could I have spread? could you have spread? could he 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 he have been spreading? could we have been spreading? could you have been spreading? could they have been spreading?
Interro-negative form
Simple form
couldn't I spread? couldn't you spread? couldn't he spread? couldn't we spread? couldn't you spread? couldn't they spread?
V-ing form
couldn't I be spreading? couldn't you be spreading? couldn't he be spreading? couldn't we be spreading? couldn't you be spreading? couldn't they be spreading?
Perfect
couldn't I have spread? couldn't you have spread? couldn't he have spread? couldn't we have spread? couldn't you have spread? couldn't they have spread?
V-ing perfect
couldn't I have been spreading? couldn't you have been spreading? couldn't he have been spreading? couldn't we have been spreading? couldn't you have been spreading? couldn't they have been spreading?