could negate
Regular verb: negate - negated- negated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could negate
you could negate
she could negate
we could negate
you could negate
they could negate 	I could be negating
you could be negating
she could be negating
we could be negating
you could be negating
they could be negating	I could have negated
you could have negated
she could have negated
we could have negated
you could have negated
they could have negated	I could have been negating
you could have been negating
she could have been negating
we could have been negating
you could have been negating
they could have been negating	

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

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