could disagree
Regular verb: disagree - disagreed- disagreed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could disagree
you could disagree
he could disagree
we could disagree
you could disagree
they could disagree 	I could be disagreeing
you could be disagreeing
he could be disagreeing
we could be disagreeing
you could be disagreeing
they could be disagreeing	I could have disagreed
you could have disagreed
he could have disagreed
we could have disagreed
you could have disagreed
they could have disagreed	I could have been disagreeing
you could have been disagreeing
he could have been disagreeing
we could have been disagreeing
you could have been disagreeing
they could have been disagreeing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't disagree
you couldn't disagree
he couldn't disagree
we couldn't disagree
you couldn't disagree
they couldn't disagree 	I couldn't be disagreeing
you couldn't be disagreeing
he couldn't be disagreeing
we couldn't be disagreeing
you couldn't be disagreeing
they couldn't be disagreeing	I couldn't have disagreed
you couldn't have disagreed
he couldn't have disagreed
we couldn't have disagreed
you couldn't have disagreed
they couldn't have disagreed	I couldn't have been disagreeing
you couldn't have been disagreeing
he couldn't have been disagreeing
we couldn't have been disagreeing
you couldn't have been disagreeing
they couldn't have been disagreeing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I disagree?
could you disagree?
could he disagree?
could we disagree?
could you disagree?
could they disagree? 	could I be disagreeing?
could you be disagreeing?
could he be disagreeing?
could we be disagreeing?
could you be disagreeing?
could they be disagreeing? 	could I have disagreed?
could you have disagreed?
could he have disagreed?
could we have disagreed?
could you have disagreed?
could they have disagreed? 	could I have been disagreeing?
could you have been disagreeing?
could he have been disagreeing?
could we have been disagreeing?
could you have been disagreeing?
could they have been disagreeing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I disagree?
couldn't you disagree?
couldn't he disagree?
couldn't we disagree?
couldn't you disagree?
couldn't they disagree? 	couldn't I be disagreeing?
couldn't you be disagreeing?
couldn't he be disagreeing?
couldn't we be disagreeing?
couldn't you be disagreeing?
couldn't they be disagreeing? 	couldn't I have disagreed?
couldn't you have disagreed?
couldn't he have disagreed?
couldn't we have disagreed?
couldn't you have disagreed?
couldn't they have disagreed? 	couldn't I have been disagreeing?
couldn't you have been disagreeing?
couldn't he have been disagreeing?
couldn't we have been disagreeing?
couldn't you have been disagreeing?
couldn't they have been disagreeing?