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