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